Joe Biden is now routinely taking some tough shots, it appears.

The former vice president and 2020 Democratic presidential hopeful ripped into President Donald Trump on Sunday, calling him “unhinged” amid Trump’s response to the House Democrats’ impeachment inquiry and the president’s allegations of wrongdoing by Biden and his son, Hunter Biden.

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Related: Biden Loses His Cool at Reporter

Speaking at a Service Employees International Union (SEIU) summit, Biden continued a new strategy of pushing back against Trump’s allegations and what his campaign has called the president’s “unprecedented abuse of power,” Fox News reported.

“Have you ever seen — rhetorical question — a president ever so unhinged as this guy is?” Biden asked on Sunday.

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The two have a history of going after each other verbally.

But the “animosity” between the men now appears ramped up, as Fox News and other outlets have pointed out, given the so-called whistleblower complaint that alleges that the president, during a July 25 phone call, pressured Ukrainian President Volodymyr Zelensky to investigate Biden and his son Hunter for potential wrongdoing connected to Ukraine business dealings.

Trump has repeatedly said that as president, he has a duty to take steps against corruption and that he never mentioned aid or the 2020 presidential campaign.

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The White House released a full transcript of the call — so there’s no question of what was said by the two men.

Related: White House Releases Transcript of Trump’s July 25 Phone Call

Speaking on Sunday morning to anchor Maria Bartiromo on “Sunday Morning Futures with Maria Bartiromo” on the Fox News Channel, Sen. Lindsey Graham (R-S.C.) — chair of the Senate Judiciary Committee — discussed the latest impeachment-connected action among House Democrats toward Trump.

Graham called out the Democratic side for its relentless and politically motivated push. “This smells,” said Graham of the endeavor. “This seems like a political set-up.”

His remarks came as the attorney for the first so-called “whistleblower” about Trump’s phone call is now saying his team represents “multiple whistleblowers.”

Trump also noted he’s going to send a letter to House Speaker Nancy Pelosi (D-Calif.) on Monday saying she should hold a House floor vote on this impeachment inquiry.

“One of the most democratic things you can do in a democracy is to have your elected representative vote on issues important to the country,” said Graham. “So it’s imperative that Democrats vote to open up articles of impeachment inquiry — not just talk about it. Don’t hide behind Nancy Pelosi,” he added.

“It’s very important that the House vote on whether or not we should go forward on impeachment. That’s the democratic way of doing business.”

Related: Piling On: Second Anti-Trump ‘Whistleblower’ May Exist

Graham also noted that this has been “the most consequential two weeks of the 2020 election [period]. What happened in the last two weeks? [Former Vice President] Joe Biden, who is leaking oil — his campaign has just completely imploded,” said the GOP senator. “I think he’s probably done. He’s the biggest victim of the whistleblower complaint, because now we know that his son was receiving $50,000 a month from a Ukrainian gas company while Joe was in charge of the Ukrainian portfolio, and $1 billion-plus from a subsidiary of a China bank — based on what qualifications?”

“So I think this is a nightmare for the Biden campaign,” added Graham.

He also noted that recently, “Bernie Sanders ha[d] a heart attack. Nancy Pelosi is now trapped. She embarked on impeachment inquiry based on a transcript she hadn’t read. And here is what I would like Fox [News] or somebody to do. Go to every Republican and ask the question: ‘Do you believe the transcript itself is an impeachable offense? What the president said on the transcript — is that his impeachable offense?’ I think it’s ridiculous to say that the president did something wrong based on the phone call,” he added. “And I think everybody in the media should go to the Democrats and ask them, ‘Why aren’t you voting to open up an impeachment inquiry?'”

On Saturday, Secretary of State Mike Pompeo defended the Trump administration over its Ukraine dealings. Pompeo told reporters governments have a “duty to investigate” potential 2016 election interference, as Fox News reported — and said the Obama administration did not do enough during its own time in power.

“This administration was incredibly focused on making sure that we worked with Ukraine in a way that was appropriate,” he told reporters while traveling in Athens, Greece.

“And it is not only appropriate but it is our duty to investigate if we think there was interference in the election of 2016,” he said.

The State Department missed a deadline on Friday to comply with a House Democratic subpoena to deliver documents related to dealings with Ukraine and Trump personal attorney Rudy Giuliani.

Pompeo said the State Department would do what the law requires it to do.

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