President Donald Trump’s decision to withdraw U.S. troops from Syria won support from the top U.S. general in the region, although he warned Islamic State may try to reassert control and influence after losing its ability to hold territory in the war-torn country.

"If the major actors and their proxies become embroiled in a competition for influence in Syria, this may create space for ISIS remnants or other terrorist groups to reform or reconstitute," Gen. Joseph L. Votel, the head of U.S. Central Command, said in a report to the Senate Armed Services Committee on Tuesday.

The general offered that caution hours before Trump’s State of the Union address to Congress, in which the president may boast that the U.S. and allies have eliminated Islamic State’s “caliphate,” its hold on a huge swath of territory in Syria and Iraq. Votel effectively endorsed Trump’s pledge to withdraw U.S. troops from Syria, although he emphasized a methodical approach.

Read more: Salt Lake Tribune