if the U.S.-México border is closed?

[roberb7]

Yes, there's been some April Foolery on this, and Doyle, some flights to MEX were cancelled last week because of the eruptions of Popocatépetl; this is a common occurrence.
Here, however, is a serious article: US will run out of avocados in three weeks if Trump closes Mexico border
My suggestion to everyone here whenever something like this comes up (and it's going to keep coming up as long as President Pussy Grabber is in office, and as long as Faux News thinks there are three Mexicos) is, money talks and bullshit walks.
To give one of thousands of possible examples, the H-E-B grocery store chain is owned by Charles Butt, who lives in San Antonio, TX. When H-E-B's northbound trucks have to sit and wait for couple of days at a border crossing (which definitely happens, but I don't know how frequently), it costs H-E-B a significant amount of money. And those fresh vegetables from Mexico aren't so fresh when they are finally placed on the store shelves. (Plus, avocados rot very quickly.)
So, when there are problems like this, you can be certain that phone calls will be made to Washington. To Sen. Cruz and Jared Kushner, among others.
So all of President Pussy Grabber's talks about the murdering, raping, drug dealing, and other criminal activity being done by our friends and neighbours is abusive and insulting, but he is ultimately mistaken when he thinks he is calling the shots.