On Monday, 50 attorneys general from US states and territories signed onto an antitrust investigation into Google, placing even more pressure on the major tech firm that is already facing intense scrutiny over its market dominance from the government.

The probe, led by Republican Attorney General Ken Paxton from Texas, will focus primarily on Google’s advertising and search businesses. But in remarks given Monday, the attorneys general suggested that they may expand the investigation later. California and Alabama are the only two state attorneys general staying out of the probe.