Three Iowa Republican caucus polls, with survey dates after the first debate last Thursday, have been released early this week. All show Donald Trump leading, with 17-22% of the 17 person field.

Dr. Ben Carson and Carly Fiorina seemed to have gained the most ground, with Carson now in 3rd place in the 270toWin Iowa average. Fiorina has pushed into 6th place after seeing her support more than double in Iowa.

Looking at some of the other results, Scott Walker remains in second overall, but has seen a notable drop-off since the debate. Jeb Bush has lost support as well, with two of this week's polls having him at just 5%. John Kasich received high marks for his debate performance, but Iowa voters were unimpressed; his level of support remained at about 3%. 

Our Iowa Republican caucus page has details on all the polls.The Iowa caucus is scheduled for February 1.

Click or tap the image above to see who is leading the polls in each Republican primary/caucus state.