Pinal County Sheriff Mark Lamb has announced his candidacy for the U.S. Senate in Arizona, becoming the first Republican to enter the race for the seat currently held by independent Sen. Kyrsten Sinema. Lamb is a vocal supporter of former President Trump and his advocacy for tougher immigration and drug smuggling laws, and has been a frequent guest on Fox News discussing immigration issues and criticizing Covid-19 vaccine requirements. His candidacy is likely to be welcomed by the Republican base, as his record of support for President Trump and his hardline stance on immigration is popular among the party's supporters.