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If the Ethics Committee does proceed, potential House actions could range from a "letter of reproval" to a recommendation of expulsion.
After a bipartisan deal was negotiated, Hoyer later backed off.
Ryan Loskarn, former chief of staff to Sen. Lamar Alexander, became part of a three-year investigation.
The outgoing New York City mayor slammed Congress on Thursday for failing to tighten national gun laws.
The speaker's grip on his conference is strong, and he's innoculated against blowback from the budget deal.
After going after outside groups on Wednesday, Boehner is digging in.
Despite facing the greatest drought since the Great Depression, the House reached new depths of embarrassment by blowing up a delicate compromise.