Rep. Seth Moulton called the deal "by far the best viable option before us."
The White House is mounting a vigorous push to convince liberals to back the Iran deal.
A man from Democratic Rep. Dan Kildee's district has been held in Iran since 2011.
"We’re still going to fight them at a lot of different levels," Obama told Dem lawmakers.
Rep. Grace Meng says she opposes the nuclear bargain.
“They’re two rogue nations," warned Rep. Ted Poe.
"As Iran grows stronger, we will be weaker to respond," said Rep. Ed Royce.
Rejecting the deal sends the message that the U.S. has "535 secretaries of State," he said.
Conservative legal activist Larry Klayman is suing to block the deal.
The State Department pushed back on claims made by Sen. Tom Cotton and Rep. Mike Pompeo.
Jason Rezaian's continued imprisonment is a wrinkle for the administration.
60 top former foreign policy officials warned Congress not to reject it.
“I think this deal will certainly go into effect," the Energy Secretary said.
Rep. John Larson's bill would allow the use of armed forces, under certain conditions.
They have scheduled one-third as many town halls as their Republican colleagues.
Top defense officials defended the nuclear deal during a Senate hearing Wednesday.
A survey by critics of the deal found an 8-point swing against it.
Celebrities appeared in a new video urging lawmakers to back the deal.
Most voters support the Iran deal, according to the poll.
The move, led by Democratic Sen. Bob Menendez, risks opposition from the White House.
Rubio said the deal "is not guaranteed beyond the term of the president."
The plea comes one year into his detention.
Critics of the deal are "the same folks who were so quick to go to war in Iraq," Obama said.
The Senate will plow through its highway bill despite the House passing its own version.