(CNN) - Republican Sen. Pat Toomey of Pennsylvania threw his weight behind Mitt Romney on Tuesday, two weeks ahead of the state's presidential primary.
"I am proud to endorse Governor Mitt Romney as the Republican nominee for president. I am confident Gov. Romney will be a great president and will return our country to the conservative principles that make our nation great," Toomey said in a statement.
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The announcement came shortly after former Pennsylvania Sen. Rick Santorum suspended his campaign. The candidate represented Romney's greatest threat in the Keystone State.
"I also congratulate Senator Santorum on a hard fought primary race. He put up a valiant fight and deserves to be commended for his spirited effort," he said.
Elected to the Senate in 2010, Toomey previously served as a three-term U.S. representative for the state and once headed the anti-tax group Club for Growth.
The announcement followed another endorsement from a high-profile Pennsylvania Republican last month. Tom Ridge, former Homeland Security secretary and former governor of the state, also backed Romney.
Toomey will speak before the Republican front-runner at a Chester County dinner Tuesday night in Pennsylvania.
The Keystone State holds is primary on April 24.
- CNN Political Producer Rachel Streitfeld contributed to this report.