President Donald Trump accidentally revealed details of his "secret" plan on Mexican migration by waving his paper in front of cameras.
The paper gave details of a regional asylum project agreed with Mexico to stave off threatened tariffs.
It laid out "a regional approach to burden-sharing in relation to the processing of refugee status claims to migrants" and talked of "45 days".
It also said Mexico had committed to immediately examine its laws and rules to enable it to implement such an agreement.
President Trump pulled the piece of paper from his jacket pocket and held it in front of reporters.
He said: "Right here is the agreement, it's very simple."
He then reached his right hand into his inside pocket and pulled out the white sheet, before raising it above his shoulder.
"That's the agreement that everybody says I don't have," he said.
"I'm gonna let Mexico announce it at the right time.
"This is one page of a very long and very good agreement for both Mexico and the United States.
"Mexico, we're getting along with them great."
The US president refused to discuss the plan, though the paper was photographed which allowed parts of it to be read.
Officials from Mexico had also revealed much of the details.
It comes after Mexico signed a pact last week agreeing to control the flow of people from Central America, including deploying 6,000 members of a new national guard along its border with Guatemala.
Mexico's foreign minister, Marcelo Ebrard, said the country had also agreed to a 45-day timeline to show increased enforcement efforts were effective in reducing the people flows.
Should that fail Mexico has agreed to consider a longstanding US demand that Central American asylum seekers crossing through Mexico apply for refuge there not the United States.
This would make Mexico a "safe third country", a demand that Mexico has long rejected.
"Safe third country could be applied if we fail, and we accept what they say," Mr Ebrard said on Tuesday evening.
He noted that Mexican legislators would then give consideration to accommodating a change in migration law.
However, he said other Latin American countries should also share the burden, something that the United States appeared to have agreed to.
Additional reporting by agencies.
