“With the new Republican majority, I see a real opportunity over the next two years to break the gridlock in Washington and actually get things done to help Ohioans and all Americans. That's where I believe I can play the most constructive role,” he said. “I don't think I can run for president and be an effective senator at the same time.”
In an interview with ABC News' Jonathan Karl earlier this fall, Portman said he was "taking a look" at a White House bid in 2016.
"I am concerned about the country, and I want to see who else jumps in,” the Ohio Republican told ABC News. “I think it's a pivotal election so I am concerned enough that I am taking a look at it.”
In 2013, Portman, a former budget director in President George W. Bush's administration, became the lone GOP senator at the time to support same-sex marriage when he revealed he made the decision because his son, Will, is gay.
For now, Portman said, "I'm excited to roll up my sleeves to make a difference for the people of Ohio and the country. While I appreciate the encouragement I have received from many to run for president, my focus will remain on Ohio and running for re-election to the Senate in 2016. I look forward to formally announcing my re-election campaign in the new year."