Former Rep. Pat ToomeyPatrick (Pat) Joseph ToomeyWH backpedals on Trump's 'due process' remark on guns Top GOP candidate drops out of Ohio Senate race Newly declassified memos detail extent of improper Obama-era NSA spying MORE (R-Pa.) has officially announced that he will take on Sen. Arlen Specter (R-Pa.) in the Republican primary.

Toomey made the announcement in a video to on his campaign's new website, ToomeyForSenate.org.

"I am running for the U.S. Senate because I believe the economic stakes for our country have never been higher," Toomey said. "The people of Pennsylvania deserve the very best from their leaders in Washington