Rep. Justin AmashJustin AmashGOP leaders agree to consider Dec. 30 spending bill House approves motion to go to tax conference — with drama Overnight Finance: House approves motion to go to tax conference — with drama | GOP leaders to consider Dec. 30 spending bill | Justices skeptical of ban on sports betting | Mulvaney won't fire official who sued him MORE (R-Mich.) won't run for the Senate, ending months of speculation and clearing the way for former Michigan Secretary of State Terri Lynn Land (R) to be the GOP nominee.

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A source close to Amash tells The Hill he has decided to forgo a bid.

Amash had long flirted with a potential bid but in recent weeks indicated he wasn't likely to run. The libertarian congressman said in late July that it would be "difficult" for any Republican to win the seat in the Democratic-leaning state, and the decision of regular ideological sparring partner, Rep. Mike Rogers (R-Mich.), not to run may have given Amash less incentive to run.

He's also carved out a niche as a leading civil libertarian in the House following his bipartisan push to defund the National Security Agency's domestic surveillance programs. That vote fell just short and helped him build his profile both nationally and within the House.

Land wasn't the GOP's first choice for the seat held by retiring Sen. Carl LevinCarl LevinCongress: The sleeping watchdog Congress must not give companies tax reasons to move jobs overseas A lesson on abuse of power by Obama and his Senate allies MORE (R-Mich.) — national Republicans had hoped Rogers or Rep. Dave Camp (R-Mich.) would run. But recent polls show Land in a close race with Rep. Gary Peters (Mich.), the likely Democratic nominee. 

Neither is well known at this point, but the race could become competitive.