Former Obama White House ethics czar Norm Eisen on Sunday pushed back on 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's assertion that political campaigns accept meetings to get dirt on opponents "all the time."

"Sir, I was a lawyer for the Obama campaign, transition and White House," Eisen wrote in response to Trump's early Sunday tweet. "This does not happen all the time. In fact, it never happened on our watch and if it had our reaction would have been 'call the FBI,' not 'if it’s what you say it is, I love it.' "

Sir, I was a lawyer for the Obama campaign, transition and White House. This does not happen all the time. In fact, it never happened on our watch and if it had our reaction would have been “call the FBI,” not “if it’s what you say it is, I love it.” https://t.co/C9d7HkHS80 — Norm Eisen (@NormEisen) August 5, 2018

Trump earlier in the day tweeted that the Trump Tower meeting between his son Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE and Russian lawyer Natalia Veselnitskaya was "totally legal and done all the time in politics."

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"Fake News reporting, a complete fabrication, that I am concerned about the meeting my wonderful son, Donald, had in Trump Tower," Trump said, referencing reports from CNN and The Washington Post that indicated he is concerned his son will face legal consequences in 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's probe.

"This was a meeting to get information on an opponent, totally legal and done all the time in politics - and it went nowhere," Trump tweeted. "I did not know about it!"

Fake News reporting, a complete fabrication, that I am concerned about the meeting my wonderful son, Donald, had in Trump Tower. This was a meeting to get information on an opponent, totally legal and done all the time in politics - and it went nowhere. I did not know about it! — Donald J. Trump (@realDonaldTrump) August 5, 2018

The statement contradicted earlier assertions by Trump administration officials that the meeting was about adoptions.

Trump Jr. last year released emails that confirmed he agreed to meet with Veselnitskaya after being promised she had "very high level and sensitive information” about the president's Democratic opponent, 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. Veselnitskaya was described as "part of Russia and its government’s support for Mr. Trump."

"If it's what you say it is, I love it," Trump Jr. wrote.

Trump's former lawyer Michael Cohen last week indicated Trump knew about the 2016 meeting before it happened.