The Senate could move to strip Americans fighting alongside Islamic State of Iraq and Levant (ISIL or ISIS) of their U.S. citizenship under a new bill set to be introduced next week by Sen. Ted Cruz (R., Texas), according to a source close to the senator’s office.

With intelligence reports indicating that up to 100 Americans could be fighting with ISIL and similar terror groups in the Middle East, Cruz and other lawmakers have warned that current U.S. regulations do not prevent these American passport holders from slipping back into the United States, where they would pose a significant terror risk.

Cruz intends to file the Expatriate Terrorist Act (E.T.A.) on Monday when the Senate is called back into session following its summer recess, according to the Cruz source.

The bill would effectively strip those Americans proved to be fighting alongside ISIL of their U.S. citizenship and block them from reentering the country. The legislation resembles a similar House bill by Rep. Frank Wolf (R., Va.) that also seeks to stem the flow of American ISIL fighters back into the country.

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