If the GOP gains a majority in the Senate in November and keeps a majority in the House, Republicans would take up a bill to secure the border, Sen. Marco RubioMarco RubioRubio: GOP Congress could go in different direction than Trump Poll: Clinton holds 4-point lead in Florida Republicans, it's time to stop asking 'What would Reagan do?' MORE (R-Fla.) predicted Tuesday.
He said if Republicans win a majority in both congressional houses they would take up a measure to increase border security early next year, around the time the Cuban-American senator has said he would decide between running for reelection or running for president.
Earlier in the day Tuesday, Rubio sent a letter to President Obama warning that broad executive action on immigration could hurt congressional action.
"If indeed you move forward on such a decision, I believe it will close the door to any chance of making progress on immigration reform for the foreseeable future," Rubio wrote.
Obama’s "pursuit of unilateral action in the midst of an election year" has "played a significant role in the humanitarian and security crisis that has been occurring on our border with Mexico," Rubio added.
The White House declined to comment on the letter, according to the Times.
Comprehensive immigration reform isn't realistic, Rubio has said, but he has been an advocate for a step-by-step approach.
Congress went on August recess without coming to terms on legislation to stem the flow of migrants who have illegally crossed the border in recent months.