Official agreement has been signed. Lets get to cnn White House Reporter Sara Westwood who has been covering the president from west palm beach. Sara, what is the president saying . Reporter after weeks of ratcheting up the pressure on mexico to do more to stop that caravan of Central American migrants heading for the southern border the president is hinting that he may have struck a deal with mexican leaders to secure more cooperation from mexico when it comes to illegal immigration. The president taking to twitter moments ago saying migrants at the southern border will not be allowed into the United States until their claims are individually approved in court. We will only allow those who come in to our country legally. Other than that our very strong policy is catch and detain. No releasing into the u. S. And then he goes on to say all will stay in mexico. If for any reason it becomes necessary well close our southern border. No way the United States will after decades of abuse put