President Donald Trump expressed regret over a mistake, hinted at significant administration staff changes, and offered his thoughts on developments in the Robert Mueller collusion investigation in a wide-ranging interview with host Chris Wallace on “Fox News Sunday” that aired Sunday morning.

Of his decision not to attend a ceremony at Arlington National Cemetery in commemoration of Veterans Day a week ago, Trump said, “In retrospect, I should have.”

“I did last year and I will virtually every year,” he said. “But we had come in very late at night and I had just left, literally, the American Cemetery in Paris and I really, probably assumed that was fine and I was extremely busy because of affairs of state,” he added.

President Trump credited his tone — which some even in his own party have criticized as too divisive — for many of his successes, including the “biggest tax cuts in history” and the elimination of the individual mandate portion of the Affordable Care Act.

“Tone is something that is important to me. But a lot of times you can’t practice tone because you have people coming at you so hard that if you don’t fight back in a somewhat vigorous way, you’re not going to win. And we have to win. This country has to win,” he said.

“We have a lot of victories coming and I think if I — if I go too low-key we’re not going to have those victories.”

The president explained to Fox News host Chris Wallace that a recent story framing his mood as angrily bitter was “disgusting fake news.”

He pointed specifically to a story in The Washington Post, chastising an outlet that he said never contacted him to get direct information on his mood.

Despite his “extremely upbeat” mood and being “very happy” with his Cabinet, he said there were “a couple of exceptions.”

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Two of the exceptions, in terms of critical members of his administration, may be White House Chief of Staff John F. Kelly and Department of Homeland Security Secretary Kirstjen Nielsen.

Acting Attorney General Matthew Whitaker does not appear to be among those whom Trump may consider dropping.

Kelly intervened on behalf of the embattled DHS secretary, whom he says is not to blame for the recent surge in the Central American caravans that have arrived and are continuing to arrive at the southern border, Politico reported on Friday.

“I’d like her to be much tougher on the border — much tougher, period,” said Trump of Nielsen, whom he said there is a chance may continue in her current position.

Related: Caravan Crush: First Wave of Migrants Arrives at Tijuana Border with U.S.

“Let’s see what happens,” said Trump about the possibility of Kelly continuing as chief of staff through 2020 — a phrase the president has used in the past that has not indicated the status quo for its targets.

The president denied knowing in advance that now-acting Attorney General Matthew Whitaker had expressed serious reservations about special counsel Mueller’s ongoing probe into alleged collusion with Russia.

Trump praised Whitaker during the interview, saying Whitaker is right in his assessment that there is no collusion on the president’s part and adding that he believes Whitaker is politically astute, smart, well-respected, and will “do what’s right.”

The president said that he is not getting personally involved with limiting or curtailing the Mueller investigation.

Rather, he will leave it to Whitaker to make those calls, including the possibility of blocking a subpoena of the president, should Mueller request it, or of limiting the information from the probe that would be presented to Congress.

He emphasized, as he has repeatedly before,  that “there was no collusion whatsoever, and the whole thing is a scam.”

He added that he has completed preparation of written answers for Mueller’s team, which will be submitted “at some point very soon.”

On whether he will sit for an interview with the team on possible obstruction, the president said, “I think we’ve wasted enough time on this witch hunt and the answer is probably, we’re finished.” But he would not place odds on whether such an interview would ever happen.

Moving to a more recent matter in the foreign affairs area — the murder of Saudi journalist Jamal Khashoggi — the president said that though he had not personally heard the tape of the incident provided by Turkish President Erdogan, it was “very violent, very vicious, and terrible.”

President Trump said, despite reports that the CIA has concluded that Mohammad Bin Salman Al Saud (MBS) ordered the killing, the Saudi crown prince has continued to tell Trump as recently as a few days before the Friday interview that he — MBS — had nothing to do with the killing.

Turning to the outcome of the midterm elections, Trump maintained his assertion that this was a victory for Republicans. Though the GOP lost, so far, about 36 seats in the House, the party gained seats in the Senate. (On Sunday afternoon, outgoing GOP Gov. Rick Scott was declared the winner of his hard-fought Senate race in Florida; Ron DeSantis, too, was recently declared the winner of the governor’s contest in Florida.)

For Trump, the gains in the Senate are paramount. He chalked up the House losses to the fact that he himself was not on the ballot and pointed out that in races where he offered support — often in the form of rallies — those candidates won.

“If [Jim Acosta] misbehaves, we’ll throw him out or we’ll stop the news conference,” said Trump.

In the matter of a federal judge ruling that CNN White House correspondent Jim Acosta must be given his press pass back, President Trump was nonplussed, laying out a simple plan for dealing with the notoriously rude reporter who dominated much of the news cycle with his antics during a press conference at the White House recently.

“If [Acosta] misbehaves, we’ll throw him out or we’ll stop the news conference,” said Trump.

He added that “rules of decorum” for conduct at White House press events will be drawn up.

He derided Acosta for being “unbelievably rude” to press secretary Sarah Sanders.

On specific changes that may be on the horizon for the press, Trump said he may turn cameras away from the press during conferences  — presumably focusing solely on the speaker at the podium — so that media members “don’t have any air time” personally, as happened with Acosta.

Trump did not mince words on his feelings about the press in general.

“I’m calling the fake news [as] the enemy,” said Trump, adding that he doesn’t mind getting bad news about himself as long as it is accurate.

Related: Why President Trump ‘Doesn’t Owe Anyone’ a Free Press Pass to the White House

“The news about me is largely phony. It’s false. Even sometimes they’ll say, ‘Uh, sources say.’ There is no source, in many cases,” he added. “I am calling fake news, fake reporting — [this] is what’s tearing this country apart.”

True to form, the commander-in-chief offered an honest assessment of his own performance nearly halfway through his first term.

“I think I’m doing a great job. We have the best economy we’ve ever had … I would give myself an A+. Is that enough? Can I go higher than that?”

And check out this video:

Michele Blood is a Flemington, New Jersey-based freelance writer and regular contributor to LifeZette.