U.S. President Donald Trump tweeted on Saturday that migrants at the U.S.-Mexico border would stay in Mexico until their asylum claims were individually approved in U.S. courts, but Mexico’s incoming government denied they had struck any deal, Reuters reported.

“Migrants at the Southern Border will not be allowed into the United States until their claims are individually approved in court. We only will allow those who come into our Country legally. Other than that our very strong policy is Catch and Detain. No “Releasing” into the U.S.,” Trump said in a tweet late Saturday.

“All will stay in Mexico. If for any reason it becomes necessary, we will CLOSE our Southern Border. There is no way that the United States will, after decades of abuse, put up with this costly and dangerous situation anymore!” Trump added in second tweet.