As part of his "Thank You Tour 2016," President-elect Donald Trump made a stop in Grand Rapids, Michigan, in front of a raucous crowd.

At one point during the night while Trump was speaking, the audience started chanting, "lock her up," referencing Trump's promise to put former Democratic presidential nominee Hillary Clinton behind bars.

But Trump had quite a surprising response to the chant, as Alexandra Jaffe from NBC News reported:

Whoa—chant of "lock her up!" from the crowd, Trump replies: "That plays great before the election – now we don’t care" — Alexandra Jaffe (@ajjaffe) December 10, 2016

Trump made headlines during his campaign when he stated he would assign a special prosecutor to investigate Clinton's FBI case and said he would put her in jail for her handling of classified emails.

"Lock her up" became an ongoing tagline of his campaign, and was regularly chanted by his supporters.

Trump told Clinton face-to-face in the second 2016 presidential debate, "I didn’t think I’d say this, but I’m going to say it, and I hate to say it, but if I win, I am going to instruct my attorney general to get a special prosecutor to look into your situation."

Clinton shot back at him, “It’s just awfully good that somebody with the temperament of Donald Trump is not in charge of the law in our country.”