As part of a fundraising effort for a leadership training fund, former president of Mexico Vicente Fox is selling T-shirts which mock President Donald Trump. The shirts bear a graphic alleging that Trump cannot build a wall on the U.S.-Mexico border if his “hands are too small.”

Lampooning Trump’s longstanding promise to construct the border wall, the T-shirt depicts him as a baby building a wall with toy blocks while wearing a soiled diaper made from the American flag.

During the 2016 presidential campaign, the size of Trump’s hands became a source of humor, most notably when referred to by former Republican primary challenger Sen. Marco Rubio, R-Fla., during a debate.

The Hill reported: Trump’s push for border wall funding from Congress fell short last month, when lawmakers passed an omnibus spending package that included gave only $1.6 billion of the $25 billion Trump asked for extra border security measures and wall construction.

This week Trump ordered deployment of the National Guard to protect the southern border, while also touting the start of construction on some areas of the border wall.

Fox, a one time opposition leader of Mexico’s right-wing party, has become one of Trump’s loudest foreign critics, endlessly ridiculing the president for his efforts to stem the flow of immigrants into the U.S.

Benefits from the shirts will go toward the former Mexican president’s non-profit group Centro Fox, which aims to “develop training for leaders dedicated to serving their community in Mexico and Latin America,” according to the group’s website.