Polls: Kasich last in Michigan
© Greg Nash

Donald TrumpDonald John Trump20 weeks out from midterms, Dems and GOP brace for surprises Sessions responds to Nazi comparisons: 'They were keeping the Jews from leaving' Kim Jong Un to visit Beijing this week MORE dominates in Michigan, while John Kasich trails the GOP field, according to a pair of polls released ahead of next week's primary.

Trump takes 29 percent support among likely GOP primary voters in a Detroit Free Press poll, followed by Ted CruzRafael (Ted) Edward CruzMcCain calls on Trump to rescind family separation policy: It's 'an affront to the decency of the American people' Cruz announces bill to end separation of immigrant families The Hill's 12:30 Report — Sponsored by Delta Air Lines — Furor grows over child separation policy MORE, at 19 percent, and Marco RubioMarco Antonio RubioHillicon Valley: Supreme Court takes up Apple case | Senate votes to block ZTE deal | Officials testify on Clinton probe report | Russia's threat to undersea cables | Trump tells Pentagon to create 'space force' | FCC begins T-Mobile, Sprint deal review Feehery: Betting on Trump Senate votes to block Trump's ZTE deal MORE, at 18 percent. 
 
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Kasich, the governor of neighboring Ohio who's trying to lean on support in the Midwest, takes just 8 percent, tying with Ben Carson, who is expected to formally suspend his campaign Friday.
 
The Ohio governor also trails his three top rivals in another Michigan poll from Mitchell/Fox 2, taking 12 percent behind Cruz, at 14 percent; Rubio, at 19 percent; and Trump, at 39 percent.
 
The polls come ahead of Thursday night's GOP debate in Detroit as the candidates look to derail Trump, who has racked up delegates in a series of wins, including on Super Tuesday this week.
 
The Free Press survey of 400 likely GOP primary voters was conducted Saturday through Monday with a margin of error of 4.9 percentage points.
 
The Mitchell survey of 679 likely GOP primary voters was conducted on Tuesday with a margin of error of 3.76 percentage points.