As POTUS tweeted, a caravan of about 4K Honduran migrants continues its trek toward the United States.
His comments come as Trump has been urging fellow Republicans to make immigration a central issue in the closing weeks of their midterm election campaigns and blaming Democrats for his failure to pass immigration legislation in the GOP-controlled Congress.
"This is what's needed to happen for a long time", Mendoza said.
Mendoza - whose police officer son was killed in 2014 by a drunk-driving illegal immigrant with a criminal record - said people will continue finding ways to cross the "porous" U.S. -Mexico border until Trump's long-promised wall is in place.
Mr Trump had earlier this week threatened to withhold aid to the region as a caravan with several thousand Honduran migrants travelled through Guatemala to Mexico in the hope of crossing into the USA to escape violence and poverty.
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I am watching the Democrat Party led (because they want Open Borders and existing weak laws) assault on our country by Guatemala, Honduras and El Salvador, whose leaders are doing little to stop this large flow of people, INCLUDING MANY CRIMINALS, from entering Mexico to U.S.
President Trump threatened to order the US military to "close" the southern border with Mexico, issuing a salvo of morning tweets that blasted Democrats, Mexico and other Latin American countries over immigration policy.
The president's warning echoes an earlier tweet on Wednesday, in which he again blasted Democrats for refusing to approve tighter border control and immigration laws.
Upon reaching Mexico, the migrants must show a valid visa to enter the country, or face deportation, therefore Trump has focused much of his pressure on the Mexican government.
He was referring to the United States-Mexico-Canada Agreement, which is awaiting ratification. In April, thousands of National Guard troops were deployed to the southern border to assist with security operations there, although their assistance was limited to surveillance work. Dwindling in numbers along the way, the caravan totalled around 150 migrants by the time it reached Tijuana, at the USA border.