Senator Ted Cruz (R., Texas) and Senator Susan Collins (R., Maine) argued during a Senate GOP lunch that if Democrats filibuster the Department of Homeland Security funding bill — which blocks implementation of Obama’s 2012 deferred action program  and his November 2014 “adult amnesty” — Republicans should respond by blocking only the 2014 orders. The thinking, according to a GOP senator who was in the lunch, is that Senate Democrats will have a harder time staying unified for a filibuster if Republicans have a narrower focus.

“What I have said for months now is the central focus of Republicans should be stopping President Obama’s unconstitutional amnesty,” Cruz told National Review Online when asked to confirm the details of his case. “That’s what Republican candidates promised the voters in November and that’s the promise we need to fulfill.”

Collins does not share Cruz’s antipathy for the 2012 program, but she told reporters that the 2014 orders are obviously unconstitutional.