The Trump administration is preparing to add Venezuela to the U.S. list of state sponsors of terrorism in what would be a dramatic escalation against the socialist government of Nicolás Maduro, according to U.S. officials and internal government emails.

The list is reserved for governments accused of repeatedly providing “support for acts of international terrorism” and includes only Iran, North Korea, Sudan and Syria.

Republican lawmakers led by Sen. Marco Rubio (R-Fla.) have pushed for the designation, citing Venezuela’s alleged ties to Lebanese Hezbollah, the Revolutionary Armed Forces of Colombia, or FARC, and other groups.