Treasury Department officials are considering rolling back a tax rule aimed at preventing American companies from moving money offshore to avoid U.S. taxes, according to several people familiar with discussions.

The $1.5 trillion tax overhaul that President Trump signed into law late last year has already given the American economy a jolt, at least temporarily. It has fattened the paychecks of most American workers, padded the profits of large corporations and sped economic growth.

Even hours after the Senate vote, tax experts were scratching their heads over precisely what had made it into the final version of the bill and the impact of some significant  provisions. Still, it was clear that many changes expanded tax benefits for the wealthiest taxpayers, while other attempts to close loopholes fell by the wayside. The bill would add $1 trillion to deficits over the coming decade.