Republicans pressed their offensive against the Democratic-led impeachment inquiry targeting President Donald Trump on Thursday with plans for a Senate resolution calling the investigation illegitimate while the White House lauded lawmakers in his party who stormed into a high-security room and interrupted testimony.

The House of Representatives is examining whether there are grounds to impeach Trump over his request in a July telephone call to Ukrainian President Volodymyr Zelenskiy to investigate a domestic political rival, Joe Biden. The former vice president is a leading contender for the Democratic nomination to face Republican Trump in the 2020 presidential election.

Trump on Monday called on Republicans to ¡°get tougher¡± in fighting the impeachment inquiry. His ally, Sen. Lindsey Graham, who on Tuesday agreed with Trump that the president was the victim of a ¡°lynching¡± by Democrats, was scheduled to announce his resolution later on Thursday. Graham¡¯s office described the measure as a resolution condemning the ¡°closed-door, illegitimate impeachment inquiry.¡±