Former friends Sens. Rand Paul (R-Ky.) and Ted Cruz (R-Texas) are facing off.
President Obama’s deferred action program shielded the man, two Republican senators say.
McCain earlier this week described the plan as a "gimmick."
Democrats are upset there hasn't been a vote to confirm Loretta Lynch.
Without the fund, several Senate Republicans say they won’t back their party’s budget.
“It’s going to be a nasty, nasty primary,” one Democratic state legislator said.
Sen. Reid accused Republicans of “empowering the ayatollahs” in Iran.
With the DHS standoff behind them, they are going on offense.
"Senate Democrats will filibuster their own bill," McConnell's spokesman said.
GOP strategists say the new revelation ensures scrutiny of Clinton’s handling of Benghazi.
McConnell worked with the minority leader to get the bill passed.
Republicans in the upper chamber worry about a fight they consider a distraction.
Sen. Mark Kirk slams House for tying immigration language to funding bill.
DHS fight has put McConnell and Boehner's odd-couple relationship on display.
Sen. Harry Reid said Democrats will seek an "overwhelming vote" in favor.
McConnell said Senate may vote "very quickly" on the measure.
The Senate’s chief referee has dealt a significant setback to conservatives.