Becoming Speaker could harm Ryan down the road, the former lawmaker says.
Former Rep. Trey Radel (R-Fla.) resigned earlier this year following a drug bust.
Curt Clawson (R) has won the GOP primary to replace former Rep. Trey Radel.
The former Florida congressman was found guilty of cocaine possession.
The leaders of the committee said they don't have jurisdiction over the ex-congressman.
At least one advocacy group is calling for the House inquiry to continue.
He returned to Congress last week for the first time since his cocaine conviction.
The Florida Republican is getting an unwelcome gift on his first day back on Capitol Hill.
Radel, who left Congress for a stint in rehab, will return Tuesday.
Rep. Trey Radel says he will return to Congress after being treated for substance abuse.
The consensus is that Radel will either not run for reelection or lose in his 2014 primary.
The former Speaker said Rep. Trey Radel won't survive if his rehab is a gimmick.
Some were serious, some were salacious.
The wealthy businessman easily carries solidly GOP Fla. seat to succeed ex-Rep. Trey Radel.
Former Rep. Trey Radel (R-Fla.) refunded more than $63,000 to campaign donors after pleading guilty...
The general election is slated for June 24.
Mack had been mulling a run for his old House seat.
With a solidly GOP seat at stake, many of the congressman's former rivals are eyeing bids.
Rep. Trey Radel returned to work vowing to "rebuild" the trust he lost.
The freshman Republican said he has not thought about running for reelection.
The group raised the money from two individuals who backed one of Radel's primary opponents.
The committee will examine whether Rep. Radel violated House rules after buying cocaine.
Opponent suggests others could be implicated in an investigation.
The Republican did not elaborate, saying, “I’ll just leave it at that.”