WASHINGTON — Lawmakers on Monday pressed for full disclosure of a whistle blower's complaint about President Donald Trump as Democratic calls for impeachment intensified over his conversation with Ukraine's leader. Trump insisted he did nothing wrong.

Democrats, and some Republicans, urged the White House to be forthcoming amid the reports that the president pressured Ukraine's leader to help investigate political rival Joe Biden at the same time the administration was withholding $250 million in aid.

Trump's call to the foreign leader, and his subsequent comments about it Monday, raised further questions about whether he improperly used his office to pressure another country as a way of helping his re-election prospects.

More House Democrats are calling for his impeachment ahead of a closed-door meeting Tuesday with Speaker Nancy Pelosi as Trump's actions pose a new test for Congress's ability to provide a check on the White House.