Ohio senator Rob Portman pulls support for Trump

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WASHINGTON, DC - JANUARY 27: Sen. Rob Portman (R-OH) testifies about the impact of heroin and prescription drug abuse and deaths in his state during a Senate Judicary Committee hearing in the Dirksen Senate Office Building on Capitol Hill January 27, 2016 in Washington, DC. The committee is working on several pieces of legislation that would assist states with abuse prevention and treatment and prosecution of those responsible for the recent spike in heroin and perscription drug overdose deaths. (Photo by Chip Somodevilla/Getty Images)

Ohio Sen. Rob Portman is revoking his support for Donald Trump and says he will instead back Trump’s running mate Mike Pence for president.

Portman says he had hoped to support his party’s nominee because he felt it was “appropriate to respect the millions of voters” who backed Trump during the GOP primary. He says that while he continues to “respect” those who back Trump, “I can no longer support him.”

Portman is running for re-election in what was supposed to be one of the most competitive Senate races in the country. However, he’s maintained a steady lead over Democrat Ted Strickland for months.