Garcia is a Mexican Supremacist.
He’s disloyal to the United States and is using his power in the interests of Mexico.
He should not only be impeached, he should be tried for treason against our nation.
My impression of people like Garcia, Julian Castro, etc. is slightly different. They aren't loyal to Mexico's government per se. Rather, their loyalty is to "La Raza."
It isn't so much that they want the US southwest to become legally part of Mexico. Instead, they want to see a demographic and cultural hegemony of Chicanos and recent Mexican immigrants throughout the region. Their ultimate goal is the complete displacement of Anglo-Americans from the region so that the whole southwest becomes a giant Latin American barrio (with people like Garcia and Castro as the Padrons).