The Morning Consult survey found support for Romney, 72, going down after he called for former national security adviser John Bolton to testify at Trump’s impeachment trial, which began on Thursday.

The poll shows the senator’s approval rating falling among Utah Republicans from September through December 2019, and independents also shifted to disapproving of Romney over the quarter.

In the prior quarter, 65% of Utah Republicans supported Romney, and while a majority still do presently, that number sank to 57%.

The numbers are particularly striking for Utah, one of the most Republican states in the country. Romney romped to victory in his 2018 Senate bid and has been considered a local hero of sorts among his fellow Church of Jesus Christ of Latter-day Saints constituents and others.