Sen. Cornyn's comments follow new revelations about alleged secret side deals.
A new report confirms lawmakers' fears about the contested secret "side deals."
Rubio wants to see any letters the administration sent to foreign governments.
The lawmakers want answers on whether the administration was briefed on the deals.
Jack Reed and Sheldon Whitehouse give the White House 23 votes out of the 34 needed.
“I hope we can defeat it, but the procedure is obviously stacked in the president's favor."
The rebels had pledged to fight only ISIS with their American training.
VIDEO | Wildfires have burned hundreds of square miles in western states.
The Foreign Relations Chairman said the deal won't keep Iran from nuclear weapons.
The letter is the latest in a growing number of Republican questions on Clinton's email.
The Nusra Front released seven U.S.-backed rebels after they were kidnapped last month.
"We could be leading a coalition of Arab allies to defeat ISIS,” she said.
But the senator says the U.S. hasn't done enough to counter Iran's support of terrorism.
“I'm not certain if he has a national security group of people," said Col. Jack Jacobs.
Twelve House Democrats now oppose the Iran deal.
An organization opposed to the deal is using Snapchat to target Sen. Ben Cardin (D-Md.).
Menendez became the second Democratic senator to oppose the deal.
Sen. Bob Menendez is the second Senate Democrat to come out against the deal.
“This agreement is the best option to halt Iran’s nuclear weapon program," said Sen. Mazie Hirono.
More than 160 Marines arrived in Germany Sunday with heavy equipment.
The former Florida governor also released a seven-point plan on veterans.
The proposal has the support of the group responsible for maintaining the memorial.
The letter comes as Congress prepares to vote on the deal next month.
“If I’m commander in chief, we’re going after these guys," he said.