President Donald Trump needs “a permanent attorney general” to supervise special counsel Robert Mueller’s probe into Russian collusion allegations and firmly take hold of the Department of Justice (DOJ) amid ongoing controversies and national crises, said former assistant Watergate prosecutor Jon A. Sale on Tuesday night on Fox News’ “The Ingraham Angle.”

Trump fired former Attorney General Jeff Sessions earlier in November and appointed acting Attorney General Matt Whitaker as a temporary replacement. The president has yet to nominate a permanent attorney general.

Mueller (pictured above left), who has been leading the investigation into allegations of collusion between Trump 2016 campaign officials and Russia since May 2017, is now winding down the probe.

Some feared Mueller and his investigation were at risk after Sessions’ departure and pushed for Congress to pass legislation barring Trump from firing Mueller.

Whitaker, who has been critical of the Mueller probe in the past, isn’t planning on recusing himself from oversight of the investigation — much to the Democrats’ chagrin.

Senate Majority Leader Mitch McConnell (R-Ky.) and other GOP senators insist Trump isn’t going to fire Mueller and that the legislation preventing the president from firing Mueller is unnecessary.

Sale told Fox News host Laura Ingraham that Mueller’s investigation “needs supervision, and I think it needs supervision by a permanent attorney general — not to cut it off, not to cut off its oxygen — but to say, ‘Let’s bring this to a reasonable conclusion.'”

Ingraham agreed, warning that “this is no time for the administration or the United States to be without an attorney general.”

“We need a permanent, top law enforcement officer in place, particularly at a time when our border is under assault,” Ingraham said, insisting that “Trump’s DOJ should be devoting its manpower and resources to defending his policies against the relentless attacks.”

Thousands of migrants from Central America — most of whom are young, single men — have crossed into Mexico with the intention of crossing the border into the U.S.

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Trump deployed approximately 6,000 U.S. troops to bolster border security efforts in anticipation of the migrants’ arrival — and Secretary of Defense Jim Mattis said last week that Trump had given him the authority to use lethal force, if necessary, to guard the safety and well-being of all CBP personnel.

The CBP also revealed that some migrants “attempted to illegally enter the U.S.” over the weekend, noting that “those persons were stopped and turned back to Mexico.”

Some migrants also threw what appeared to be rocks at enforcement officials.

DHS Secretary Kirstjen Nielsen warned in a statement on Sunday that the DHS would “not tolerate this type of lawlessness and will not hesitate to shut down ports of entry for security and public safety reasons.” She added, “We will also seek to prosecute to the fullest extent of the law anyone who destroys federal property, endangers our frontline operators, or violates our nation’s sovereignty.”

She also told Sean Hannity of Fox News on Tuesday night on “Hannity,” “The president has made it quite clear. We will not tolerate illegal or violent entry into our country. So, this time, he talked about it for a month in advance as the caravans were making their way up. He raised awareness. He called in the military. He called in concertina wire.  We hardened the ports.  We called in additional law enforcement, state, local and federal. And we are prepared. We will be prepared. We will not allow illegal entry into our country.”

Trump also needs a permanent attorney general to provide the “very strong hand at the Justice Department” that has “been lacking for some time,” former federal prosecutor Andrew McCarthy told Ingraham on “The Ingraham Angle.”

“I’m a Jeff Sessions fan. But you know, if you don’t have the president’s confidence, then you can’t be effective in that position. So we really had a void at the Justice Department for a while,” McCarthy noted.

Related: With Sessions Gone, Trump Is ‘Entitled’ to Attorney General Who Has His ‘Full Confidence’

McCarthy added that what Ingraham “talked about in terms of stepped-up border enforcement and the things that we could do now if we exploited the American laws that we have on the books now, that’s a position that can be forged by somebody that the courts know as a force to be reckoned with.”

Ingraham also said the U.S. needs “a new AG to help restore public trust” at the “Department of Justice and the FBI” following the “reputational harm” wreaked during the Obama administration with its politicized DOJ and FBI.

“It’s time for the president to turn the page and nominate someone with experience and credibility to head the DOJ,” Ingraham said.

One of the latest updates in the Mueller probe involved conservative author Jerome Corsi, who told Fox News host Tucker Carlson on Tuesday night that Mueller’s team accused him of lying to them under oath about email correspondences with former Trump campaign adviser Roger Stone because he “couldn’t give them what they wanted” to incriminate Trump.

Corsi revealed Monday he would reject the Mueller team’s plea deal stipulating that he admit to perjury.

Corsi and Stone emailed about WikiLeaks founder Julian Assange’s intentions to release emails from former Clinton campaign chairman John Podesta during the 2016 presidential election.

Pollster and former Clinton adviser Mark Penn told Ingraham that the Mueller investigation “has been discredited, and they don’t want to end it in a fair way.”

Penn also predicted that Mueller will issue a report that is “as damning as possible” to Trump.

Check out more in the video below: