Donald Trump "richly deserves" to be impeached, the chairman of the House Judiciary Committee which can unilaterally launch proceedings to remove the president from office has said.

Rep. Jerrold Nadler has previously said that Mr Trump was guilty of committing "high crimes and misdemeanors" - the benchmark for impeachment - but these were his strongest comments yet.

"My personal opinion is that [Trump] richly deserves impeachment," Rep. Nadler told CNN's 'State of the Union'. "He has done many impeachable offences, he's violated the law six ways from Sunday."

Rep. Nadler stopped short of joining a growing number of House Democrats calling for a full impeachment inquiry when pressed on his comments, but was steadfast on his general position.

"The question is, can we develop enough evidence to put before the American people? We have broken the logjam. The president and the attorney general were lying to the American people constantly."