President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Friday lashed out at Democrats over their ongoing investigations into his administration, suggesting there should instead be probes into former President Obama's book deal and other activities under his predecessor.

"They want to investigate, they want to go fishing and I watched Bob Mueller and they have nothing," Trump said of Democrats during an Oval Office gathering to announce an agreement with Guatemala.

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"It’s a disgrace," he continued. "We want to find out what happened the last Democrat president. Let’s look into Obama the way they’ve looked into me. From day one they’ve looked into everything we’ve done."

"They could look into the book deal that President Obama made. Let’s subpoena all of his records," Trump continued. "Let’s subpoena all of the records having to do with Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE and all of the nonsense that went on with Clinton and her foundation and everything else."

Obama and former first lady Michelle Obama Michelle LeVaughn Robinson ObamaBlack stars reimagine 'Friends' to get out the vote Obama shares phone number to find out how Americans are planning to vote Michelle Obama: 'Don't listen to people who will say that somehow voting is rigged' MORE signed lucrative book deals with Penguin Random House in 2017 after they left office. The terms of the agreement were not disclosed.

It is not uncommon for presidents to sign book deals to write a memoir upon leaving office. Former President George W. Bush signed a deal with Crown Publishing in 2009.

In a bizarre criticism later in the media availability, Trump complained about a new air conditioning system he said was installed in the West Wing during the Obama administration.

"It was so good before they did the system," said Trump, who would not have worked in the West Wing with the old system. "Now that they did the system, it’s freezing or hot in here."

But Trump frequently targets Obama for criticism and has spent much of his administration undoing policies implemented by his predecessor.

His latest call for an investigation is likely to renew criticism that Trump tends to float wielding the Justice Department against political opponents.

Trump's rant on Friday came as Democrats vowed to continue investigations into Trump's possible obstruction of justice and abuse of power.

Former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE testified on his sweeping investigation before two House Committees earlier this week. While his testimony was uneven at times, Mueller explicitly laid out his findings about Russian interference in the 2016 election to aid Trump.

The testimony gave a renewed sense of urgency to some Democrats seeking to remove Trump from office. Multiple Democratic lawmakers have come out in favor of launching an impeachment inquiry in the wake of Mueller's testimony, bringing the total number in favor of such a move to nearly 100.

The president was set off by a question about House Judiciary Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) indicating the panel would sue to enforce a subpoena against former White House counsel Don McGahn.

"What they’re doing is a disgrace," Trump said. "So destructive to our country, and I think that’s why we’re going to take back the House."

Updated 5:22 p.m.