I could have said, 'Mitt, drop to your knees!' and he would have dropped to his knees.'”

“drop to your knees”是个双关语，即可以指跪求，也可以指suck dick：

Creepy Trump Tells Apprentice Contestant, "Must Be a Pretty Picture, You Dropping to Your Knees".

https://www.google.com/webhp?sourceid=chrome-instant&rlz=1C1CHFX_enUS650US650&ion=1&espv=2&ie=UTF-8#q=drop%20to%20your%20knees