LAS VEGAS — Vice President Kamala Harris said Sunday that she would “double” Justice Department resources to crack down on cartels and cut the flow of fentanyl into the U.S., just hours after former President Donald Trump repeated his false claim that she wants to legalize the drug.

“As president, I will double the resources for the Department of Justice to go after those transnational cartels and take action to stop the flow of fentanyl coming into our country, which is destroying entire…