Donald Trump’s name is not on the ballot Tuesday in Ohio’s Republican Senate primary. 

But his clout is very much on the line.

The former president and presumptive 2024 Republican presidential nominee endorsed Bernie Moreno, a former car dealer and blockchain entrepreneur, in a race that the campaigns treated as a toss-up in the closing days. Recent polling has shown a dead heat between Moreno and state Sen. Matt Dolan, whom Trump attacked as a “RINO” — or Republican in name only — at a rally Saturday near Dayton.

Voters head to the polls Tuesday in Ohio, where a closely watched and increasingly contentious Republican Senate primary has become a high-profile test of former President Trump's immense grip over the GOP.

The winner of the primary will face off in November's general election against one of the most vulnerable Senate Democrats in a race that may determine whether Republicans win back the chamber's majority.

Donald Trump's sway over Ohio Republicans will be tested in the state's U.S. Senate primary on Tuesday, when they decide whether to nominate a political newcomer backed by the former president to challenge Democratic U.S. Senator Sherrod Brown in November.

Republicans are looking to erase Democrats' 51-49 majority in the chamber, and face a geographical advantage as Democrats are defending a half-dozen seats in competitive states including Ohio.