US President Donald Trump has said that he was acting for Russia.
Addressing reporters at the White House as he left for Louisiana, he said: "I never worked for Russia."
He added, "I think it's a disgrace that you even ask that question because it's a whole big fat hoax."
Mr Trump has been interviewed by Fox News in an interview aired on Saturday, and called it "insulting".
Mr Trump had confiscated the notes of his own interpreter after a meeting with Russian President Vladimir Putin.
According to the Washington Post newspaper, he ordered the translator not to discuss the details of what was said.
ABC News reports that Mr Trump's meetings with Mr Putin are in the House of Representatives.
Outside the White House on Monday, Mr Trump maintained nothing untoward during his discussions with Mr Putin.
"It was a very, very successful meeting," he told journalists, "we talked about Israel, we talked about the pipeline that is paying a lot of money.
"We have those meetings no big deal."
- Trump denies hiding detail of Putin talks
- FBI 'checked if Trump was working for Russia'
Kremlin plot to sway the 2016 United States Presidential election in Mr Trump's favor.
Democratic lawmakers, meanwhile, have Mr Trump not to interfere with his hearings after he was assassinated Michael Cohen, who wants to testify before a congressional committee next month.
In a joint statement, Elijah Cummings, Adam Schiff and Jerrold Nadler said Mr. Trump must not try to "discourage, intimidate or otherwise pressure" his former personal fixer.
In his Saturday night appearance on Fox News, Mr. Trump made a cryptic remark, saying that Mr. Cohen "should give information on his father-in-law.
In December, Mr Cohen admitted arranging hush money payments to Mr. Trump's alleged lovers, blaming his former boss for leading him to "choose the path of darkness".
He has agreed to appear before the House Oversight Committee on 7 February.