L PASO, Texas (AP) — President Barack Obama says his administration has answered the concerns of Republican lawmakers who want the U.S.-Mexico border better secured before they are willing to take on comprehensive immigration reform.

Standing at the border Tuesday, Obama mocked Republicans for never being satisfied and always changing the conditions about what's needed to secure the border.

Said the president: "Maybe they'll say we need a moat. Or alligators in the moat."

Obama says that stepped-up enforcement is getting results.

Obama used his speech in El Paso, Texas, to push Congress to work with him on a plan to give millions of illegal residents a path to citizenship.

He also said a burden rests with illegal immigrants to do right by the law. He said they make a "mockery" of all those who try to immigrate legally.