Illinois Sen. Mark Kirk withdrew his support of Donald Trump in June. | Getty Sen. Mark Kirk calls for Trump's 'emergency replacement' on GOP ticket

Illinois Sen. Mark Kirk called on Donald Trump to drop out of the presidential race in the wake of vulgar boasts he made about women in a leaked video tape.

Kirk, who withdrew his support for Trump in June, calling him "too bigoted and racist" to be president, also urged the Republican Party on Friday to "engage rules for [Trump's] emergency replacement."


After the Washington Post published the leaked video recording, Kirk also called Trump "a malignant clown" and said he was "unprepared and unfit to be president of the United States."

Kirk is one of the GOP's most embattled senators, facing a strong challenge from Rep. Tammy Duckworth, who leads him in most public polls.

President Barack Obama returned on Friday to his hometown of Chicago, where he plans to hold fundraisers and cast an early vote for Hillary Clinton and for Duckworth.