Trump makes crude reference to male genitalia in speech attacking Hillary Clinton
GOP presidential candidate Donald Trump adddresses an audience in Grand Rapids, Michigan on Dec. 21, 2015. (YouTube)

Republican presidential candidate Donald Trump's speech on Monday attacking former Secretary of State Hillary Clinton took an uglier-than-usual turn, Think Progress reported.

Footage from Trump's appearance in Grand Rapids, Michigan, shows him discussing her 2008 Democratic primary loss to then-Sen. Barack Obama and saying, "She was going to beat Obama. I don't know who'd be worse. I don't know. How does it get worse? She was favored to win and she got schlonged. She lost. She lost."

As Think Progress noted, the word "schlong" is a slang term for penis.

Trump also repeatedly called it "disgusting" that Clinton used the bathroom at one point during Saturday's Democratic debate, causing her to miss the event's return from a commercial break.

"They had to start the debate without her. Phase two. Why? I know where she went," the Republican front-runner said. "It's disgusting. I don't want to talk about it. It’s too disgusting. Don’t say it, it's disgusting. We want to be very, very straight up."

The remark was reminiscent of Trump's attack against Fox News host Megyn Kelly in August, when he accused her of having "blood coming out of her wherever."

Trump's latest statement, as posted online on Monday, can be seen below.