"I think the House has to initiate an impeachment inquiry as a means of securing the documents and witnesses necessary to understand the whole story, and particularly the latest chapter involving Ukraine," Durbin told a small group of reporters.

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"I believe we're headed for a confrontation with the Trump administration when it comes to the evidence that is needed to pursue this impeachment inquiry and ultimately that will be resolved in the Supreme Court as I see it. So I believe an official inquiry that sets the stage for that issue to be resolved needs to be started," he added.

Durbin, on Tuesday, predicted that the House would ultimately move on impeachment.

"I think this may be the straw that broke the camel's back." he said. "I think now we have to move forward."