President Joe Biden managed once again to send former President Donald Trump’s campaign spokesperson into conniptions on Thursday. The president kicked off July 4 celebrations with a rousing speech at the White House honoring the sacrifice of veterans — but he appeared to veer off-script at one point to make a jab at former Trump for his disrespect of American troops. Specifically, he referenced 2020 reporting in The Atlantic that Trump didn’t want to visit a French gravesite for 1,800 U.S. Marines from World War I, disparaging them as “losers” and “suckers” for giving their lives for their co…