U.S. Sen. Brian Schatz was one of eight senators who introduced a bill today prohibiting President Donald Trump from starting a preemptive war against North Korea without express authorization from Congress.

The bill, according to a press release from Schatz’s office, was introduced amidst the escalation of irresponsible rhetoric and contradictory behavior from President Trump and officials in his administration. It prohibits funds from being used for kinetic military operations without Congressional approval unless the United States faces an imminent threat or such action is necessary to defend citizens or allies.

Schatz joined Chris Murphy (D-Conn.), Tammy Duckworth (D-Ill.), Cory Booker (D-N.J.), Bernie Sanders (I-Vt.), Jeff Merkley (D-Ore.), Elizabeth Warren (D-Mass.), and Tom Udall (D-N.M.) in introducing the bill.

“Our bill makes it clear that the president does not have the authority to engage in preventive war without approval from Congress, and it goes so far as to tie the purse strings so that the president will have to ask for Congressional approval before taking any preventive action, ” said Schatz in a statement. “I want to emphasize what this bill does not do. It does not limit the ability of the United States to protect our allies. Japan, South Korea, and every other ally of the United States should rest assured that we stand with them, and we will have their backs.”

The full text of the “Preventing Preemptive War in North Korea Act of 2017” bill is available here.