CNN's Manu Raju contributed to this report.
In response to Republican Mark Kirk's reversal on his endorsement of Donald Trump, Tammy Duckworth's Deputy Campaign Manager Matt McGrath issued the following statement:
"What took so long? Apparently for Mark Kirk, it's acceptable to refer to Mexicans as raptists; to propose banning Muslims from entering the country; to call women fat pigs and dogs; to mock a reporter's disability; and to insult just about everyone who doesn't look like Donald Trump. Until today, and for nearly a year, Kirk was fine with all of that, and even saw a 'net benefit' in Trump's campaign, and offered himself up as a potential adviser. Yesterday, Tammy Duckworth called Senator Kirk's silence in the face of Trump's bigotry a betrayal, and we're standing by our statement."