House Speaker John Boehner has warned President Obama against taking executive action on immigration, one day after Obama said he would act by the end of the year. Obama had previously delayed steps on immigration until after the midterm elections, which brought a wave of Republican triumphs on Tuesday. Speaking at his first news conference since the victory, Boehner threatened to withhold cooperation if Obama moves ahead.

House Speaker John Boehner: “I believe that if the president continues to act on his own, he is going to poison the well. When you play with matches, you take the risk of burning yourself. And he’s going to burn himself if he continues to go down this path.”

Boehner also vowed to prioritize votes to approve the Keystone XL pipeline and repeal Obama’s signature healthcare law. House Republicans have already voted more than 50 times to repeal Obamacare.