President Donald Trump defended his eldest son in a tweet Sunday morning, insisting that the meeting Donald Trump Jr. had with a Russian attorney in June 2016 at Trump Tower to get "dirt" on Hillary Clinton was "totally legal."

"Fake News reporting, a complete fabrication, that I am concerned about the meeting my wonderful son, Donald, had in Trump Tower," the president tweeted. "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!"

Trump's former personal attorney, Michael Cohen, said the president knew about, and approved of, that meeting. Trump Jr. told the Senate Judiciary Committee that he couldn't remember whether he told his father about the meeting.

Jay Sekulow, a Trump attorney, agreed Sunday with Trump's tweet during an appearance on ABC's "This Week."

"The question is how would it be illegal?" Sekulow said of Trump Jr.'s meeting. "You have to look at what laws, rules, statutes were really broken here."

Legal experts have pointed to a possible violation of federal election laws, which ban taking anything of value – which could include information on a political opponent – from a foreign government trying to influence a U.S. election. The Russian attorney at that meeting, Natalia Veselnitskaya, has close ties to the Kremlin.