Speaker of the House Nancy Pelosi has called out President Trump, accusing him of being involved in a 'cover-up.'

"We do believe that it is important to follow the facts, we believe that no one is above the law, including the president of the United States, and we believe the president of the United States is engaged in a cover up, in a cover up," she told reporters on Capitol Hill.

Trump and Pelosi have often exchanged words, but Pelosi has been one of the few Democrats who have been reluctant to impeach the embattled president.

Pelosi has been preoccupied with pushing for Trump's tax returns. Diring last month's '60 Minutes' interview she said:

"It should not have taken this long for the president-- he said he was under audit. When I was in a-- I was going to a Martin Luther King breakfast in San Francisco and one of the waiters there said to me, "Madame Speaker, when the president says the Mueller report's going on too long just tell him not as long as your audit. Everybody has released their returns and we will have legislation to say that everyone should-- must, but for the moment he's been hi-- so what's he hiding?"

Trump appears to have responded to Pelosi's words as he tweeted out the following message on Wednesday morning:

"Everybody, including me, thought that when the 40 Million Dollar Mueller Report was released with No Collusion and No Obstruction (of a crime caused by others), that was the end. But no, the Democrats want to keep it going in an effort to help them in 2020. Bad for the Country!"

Trump will need to work hard to disprove that he is part of a cover-up. Recently former White House Counsel Don McGahn who refused to appear, citing Trump's instruction that he not testify to the Democrat-led House Judiciary Committee.

Attorney General William Barr also refused to show up for a hearing which many feel, was at the direction of the president.