“Moving forward, my administration will interpret and implement the provisions described below in a manner that best preserves the flexibility on which our safety depends and upholds the values on which this country was founded,” Obama said in the signing statement.

Signing statements allow presidents to raise constitutional objections to circumvent Congress‘ intent. During his campaign for the White House, Obama criticized President George W. Bush’s use of signing statements and promised to make his application of the tool more transparent.

Obama’s signature caps months of wrangling over how to handle captured terrorist suspects without violating Americans’ constitutional rights. The White House initially threatened to veto the legislation but dropped the warning after Congress made last-minute changes.