About that deal with Mexico

President Donald Trump boasted of “large” agricultural sales to Mexico as part of a deal reached Friday on border security and illegal immigration that averted the threat of U.S. tariffs, but the deal as released had none, and three Mexican officials say they’re not aware of any side accord.

  Bloomberg

In this instance, it's 50/50 whether he's simply lying to his followers or he really had no idea what the deal entails.

The State Department didn’t respond to an inquiry made through its press department. The White House declined to comment or offer proof to back up Trump’s tweet. The Mexican foreign ministry’s press office declined to comment.

[...]

Increasing Mexico’s purchases from the U.S. wasn’t discussed during the three days of talks in Washington that led up to Friday’s agreement, said the three people with knowledge of the deliberations who weren’t authorized to speak publicly.

[...]

Mexico is already a large buyer of U.S. farm goods, including corn, soybeans, pork and dairy products. It had given no indication of attempting to find alternative suppliers during the one-week standoff over Trump’s proposed steep tariffs on Mexican goods.

...but hey, do what you want...you will anyway.

UPDATE 6/9:  Still peddling that lie.