Senate Majority Leader Mitch McConnell has a hard road ahead.
The new dynamic will almost certainly complicate life for Obama and McConnell.
Sen. Ted Cruz is gearing up for another showdown with Republican leaders in Congress.
Losing the Senate should force Obama to deal with them, says GOP.
Congress faces a Sept. 30 deadline to pass a government funding bill.
John Cornyn and John Thune noted that the move hasn't been ruled out.
Clinton is dismissive of the GOP effort, which her campaign team sees as pure politics.
Even the most prudent senators say they would back Trump in the general election.
His push comes after a massive hack on a New York BlueCross BlueShield plan was revealed.
GOP says it will force more votes on Iran next week.
Some Democrats are wavering over whether to filibuster the disapproval measure.
Reid says America "will uphold its commitment" and pass Iran deal.
It brings the number of Senate Democrats backing the agreement to 36.
Senate Republican leaders have been dreading the return from the August recess.
She is the last undecided Senate Republican who might conceivably side with Obama.
Reid's tack differs with House Democratic Leader Nancy Pelosi's.
The Democratic whip is the only member of leadership to embrace the deal thus far.
Sen. Dick Durbin is among those backing Schumer.