By Sam Gringlas Sen. Markwayne Mullin, R-Okla. spoke with reporters at the Capitol on Thursday. President Trump announced that Mullin is his pick to replace Kristi Noem as the head of the Department of Homeland Security. Anna Moneymaker/Getty Images North America hide caption President Donald Trump announced Thursday that he has chosen Sen. Markwayne Mullin, R-Okla., to be the next Secretary of Homeland Security. If confirmed, Mullin would replace Kristi Noem, who has led the agency through a broad and controversial crackdown on immigration in the country. Trump announced the decision in a post on his social media site, Truth Social. "Markwayne will work tirelessly to Keep our Border Secure, Stop Migrant Crime, Murderers, and other Criminals from illegally entering our Country, End the Scourge of Illegal Drugs and, MAKE AMERICA SAFE AGAIN. Markwayne will make a spectacular Secretary of Homeland Security," Trump wrote.…