Sen. Marco Rubio, R-Fla., requested that the Justice Department look into whether former Secretary of State John Kerry violated federal laws by meeting with the Iranian foreign minister, a move already blasted by top Trump administration officials.

In a letter to Attorney General Jeff Sessions on Tuesday obtained exclusively by Fox News, Rubio said that Americans “deserve to know that U.S. laws are enforced regardless of any individual’s past position.” He encouraged the department to determine whether Kerry violated the Logan Act or the Foreign Agents Registration Act.

The Logan Act prohibits unauthorized personnel to negotiate with a foreign government in relation to any disputes with the U.S., whereas the Foreign Agents Registration Act is a statute that requires persons or companies acting on behalf of foreign governments, political parties or individuals to disclose details of their interactions.