Support for Donald Trump is weakening in Michigan, while both Ted Cruz and John Kasich are on the rise, says a new poll of the Republican primary there by Monmouth University. The poll found Trump with the support of 36 percent of Michigan Republicans, who will vote in the presidential primary on Tuesday, with Cruz earning 23 percent and Kasich 21 percent. Marco Rubio has just 14 percent support.

Monmouth conducted its poll over four days, before and after the weekend’s five nominating contests, and found an interesting shift in the latter half of their polling. “In interviews conducted Thursday and Friday, Trump held a solid lead with 39% support compared to 22% for Cruz, 17% for Kasich, and 14% for Rubio. The race was much tighter in Saturday and Sunday interviews at 32% for Trump, 26% for Kasich, 25% for Cruz, and 12% for Rubio,” the polling outfit reports.