Rep. Mike Rogers (R-Mich.) on Sunday praised Russian physical security and counterterrorism efforts...
The Homeland Security chief said it's likely "something will detonate" during Olympics.
The Michigan Democrat warned that threats remain, despite "guards, gates and guns."
She denied Obama is trying to send a message by staying away from Sochi.
The updated alert was issued as the Olympic Games began in Sochi on Friday.
Obama sent two openly gay athletes to represent the U.S. at the Olympics.
Rep. Ruppersberger (D-Md.) hopes Putin won't get in the way of proper security.
Rep. William Keating urged Americans in Sochi not to run afoul of Russia's anti-gay laws.
Mike Morrell said he'd worry about hotels and airports away from Sochi.
"Hopefully, things will work out, but it's nowhere near ideal,” King added.
On a visit, Rep. Mike McCaul says Sochi is “very well fortified and very well protected.”
Two U.S. Navy ships stationed in the Black Sea will be available if requested.
The warning comes after two suicide bombings occurred last month in the city of Volgograd.