President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Wednesday expressed surprise that cameras captured some of the contents of a sheet of paper he claimed contained details of an undisclosed agreement between the U.S. and Mexico.

"When I held it up to the sunlight and it was closed and you were able to read it through the sunlight, that was not anticipated," Trump said at a press conference alongside Polish President Andrzej Duda. "But regardless, I mean, you knew enough of what it said. I didn’t do it on purpose. But we have a lot of strength in 45 days if we decide to use that strength."

Trump pulled the sheet of paper from his breast pocket as he left the White House on Tuesday for a trip to Iowa. He did not reveal any details about it, saying he would let Mexico share the specifics when it was ready to do so.

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But photos quickly circulated online from photographers who snapped photos of the paper illuminated in the sunlight, which made some of the text visible.

Jabin Botsford, a photographer for The Washington Post, tweeted photos that captured some of the document's wording, including that the Mexican government "will take all necessary steps under domestic law to bring the agreement into force with a view to ensuring that the agreement will enter into force within 45 days."

The document was signed and dated June 7, 2019.

The two countries reached a deal late last week for Mexico to take additional steps to curb the flow of migrants toward the U.S. after Trump threatened to impose a 5 percent tariff on all Mexican goods.

In the days since, Trump has sought to sell the deal amid criticism Mexico hadn't agreed to anything it wasn't already planning to do. One method has been to tout a secretive arrangement that will be announced at a later date, though Mexican officials have said such a pact doesn't exist.

The comments have underlined an apparent disconnect between U.S. and Mexican officials on what was specifically established.

The president on Wednesday argued that his threat of tariffs had strengthened the relationship between the two countries and reiterated that he believes Mexico is doing more to assist the U.S. immigration system than Democrats in Congress.