Wisconsin Gov. Scott Walker is used to being disrupted.

So when union protesters began shouting during his remarks at the Iowa State Fair today, it was nothing new.

“I am not intimidated by you, sir, or anyone else out there,” Walker said to the man, who appeared to be in the front row.

“I will fight for the American people over and over and over and over and over again. You want someone who’s tested? I’m right here. You can see it! This is what happened in Wisconsin. We will not back down. We will do what is necessary to defend the American people going forward,” Walker said to wild applause.

Carol Hunter of the Des Moines Register tweeted there was pushing and shoving in the area during Walker’s speech.