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Obama faced competing pressures from immigration advocacy groups that wanted prompt action and from Democrats worried that acting now would energize Republican opposition against vulnerable Senate Democrats. Among those considered most at risk were Democratic Sens. Mark Pryor of Arkansas, Mary Landrieu of Louisiana and Kay Hagan of North Carolina.

Obama advisers were not convinced that any presidential action would affect the elections. But the officials said the discussions around timing grew more pronounced within the past few weeks.

Ultimately, the advisers drew a lesson from 1994 when Democratic losses were blamed on votes for gun-control legislation, undermining any interest in passing future gun measures.

White House officials said aides realized that if Obama's immigration action was deemed responsible for Democratic losses this year, it could hurt any attempt to pass a broad overhaul later on.