Federal authorities have seized more than 300 drones flying near World Cup stadiums across the U.S. since the tournament began June 11.
SoFi Stadium workers say they have reached a tentative contract deal, averting a strike ahead of the U.S. men's soccer team's opening World Cup match.
The referee was "determined to be inadmissible due to vetting concerns and was denied entry," a U.S. Customs and Border Protection spokesperson said, without going into further detail.
Iran's World Cup team arrived in Mexico wearing lapel pins highlighting the victims of a deadly missile strike on an elementary school at the start of the war in the Mideast.
Secretary of State Marco Rubio indicated last week the Trump administration had "no problem" with providing visas to Iran's team.
High temperatures could be in place in several of the host cities during the World Cup.