An immigration bill backed by President Donald Trump would reduce both economic growth and the number of jobs in the U.S., according to a new study from the institution he attended.

By 2027, finds the University of Pennsylvania’s Wharton Budget Model, the bill would reduce economic growth by 0.7% relative to current law and reduce jobs by 1.3 million.

The analysis covers the Reforming American Immigration for a Strong Economy, or RAISE Act, introduced by Republican Sens. Tom Cotton of Arkansas and David Perdue of Georgia and endorsed by Trump on Aug. 2. The bill would cut the number of legal immigrants who come to the U.S. annually in half, and create a system based on merit.

See:Trump backs hardline immigration bill.

Job losses are projected to occur since domestic workers won’t fill all the jobs that immigrant workers would have filled, the analysis concludes.

“The domestic worker participation rate won’t increase enough to fill the jobs that would have been held by immigrants who are no longer allowed in the country,” it says.

Cotton and Perdue, meanwhile, argue that the changes sought by their bill would be a boon to the economy.

“They would ultimately reduce our annual immigration levels by half after ten years and reorient it toward high-skilled workers, which is just what our economy needs,” the senators wrote in a USA Today op-ed published Tuesday.

Trump has made cracking down on illegal immigration a priority for his administration. By backing the Cotton-Perdue measure, he has also inserted himself into efforts to change the legal immigration system.

Passage of the bill is seen as a longshot, with no other lawmaker signing on as a co-sponsor.

Also read:The biggest reason to oppose Trump’s immigration plan — we need the money.

And:Trump adviser Miller lashes out at reporter for ‘cosmopolitan bias’ during immigration briefing.