Tony La Russa says the Red Sox had a good visit to Donald Trump's White House last month ... telling TMZ Sports they made the trip to show support for their country.
"The flag, anthem, White House," La Russa says ... "Anything that represents our government, we support."
Of course, some of Boston's biggest names decided not to go to 1600 Penn Ave. for political reasons ... guys like Mookie Betts and David Price , as well as manager Alex Cora , skipped it.