Bob Vander Plaats, an influential Iowa evangelical leader, endorsed Ron DeSantis for president Tuesday, boosting the Florida governor as he goes all in on the leadoff caucus state in an effort to trip up Republican front-runner Donald Trump .

Vander Plaats is the second major backer DeSantis has picked up in Iowa this month, joining popular Gov. Kim Reynolds.

Evangelicals are a crucial voting bloc in Iowas Republican caucuses. Vander Plaats, president of the Family Leader, has endorsed the eventual winner in every GOP caucus since 2008 and is potentially jeopardizing his streak by picking DeSantis, who trails far behind Trump in polls. His decision will test his sway among Iowa evangelicals, many of whom continue to support Trump.