President Trump on Wednesday teamed up with two conservative Republican senators to roll out new legislation aimed at dramatically curbing legal immigration to the United States, a key Trump campaign promise.

Sens. Tom Cotton Tom Bryant CottonRenewed focus on Trump's Supreme Court list after Ginsburg's death Republicans call for DOJ to prosecute Netflix executives for releasing 'Cuties' Loeffler calls for hearing in wake of Netflix's 'Cuties' MORE (R-Ark.) and David Perdue (R-Ga.) have been working with White House officials to revise and expand a bill released earlier this year that would halve the number of people who receive legal permanent residence over a decade.

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The senators joined Trump at a White House ceremony to announce the measure.

The president told reporters in the Roosevelt Room that the measure “would represent the most significant reform to our immigration system in a half a century."

They say the legislation would move the United States to a "merit-based" immigration system and away from the current model, which is largely based on family ties.

The measure reflects Trump’s rhetoric during the 2016 campaign, when he argued that the spike in legal immigration over the past several decades has taken job opportunities away from American citizens and threatened national security.

"As a candidate, I campaigned on creating a merit-based immigration system that protects U.S. workers and taxpayers and that’s why we are here today," he said, adding the measure would "reduce poverty, increase wages and save taxpayers billions and billions of dollars."

Trump met with Cotton and Perdue in March to discuss the legislation, known as the Reforming American Immigration for a Strong Economy (RAISE) Act.

The bill would mark a dramatic change in U.S. immigration laws, and could open up a nasty internal fight among Republicans.

The legislation would eliminate immigration preferences currently given to extended family members and adult children of U.S. citizens seeking green cards, and it would cap the number of accepted refugees at 50,000 — half of the Obama administration’s target for 2017.

It would also end the State Department's Diversity visa lottery, which the senators say is “plagued with fraud.” The program had been allotted 50,000 visas for the 2018 fiscal year.

About 1 million immigrants receive green cards per year.

Conservative outside groups immediately praised the legislation and called for the Senate to vote on the bill.

“The RAISE Act helps realize President Trump’s vision of making America great again by making immigration great again as well. It provides a pathway for a modern, smarter immigration system while protecting those Americans struggling to make ends meet," said Dan Stein, president of Federation for American Immigration Reform.

Roy Beck, president of NumbersUSA, added that the Cotton-Perdue bill will "do more than any other action to fulfill" Trump's campaign pledges on immigration.

The legislation faces an uphill battle in the Senate, however, where it’s expected to get pushback from Democrats as well as GOP senators who oppose strict limits on legal immigration and want a broader reform effort that would address the roughly 11 million undocumented immigrants living in the U.S.

If Cotton and Perdue can get GOP leadership to bring the legislation up for a vote, supporters will need to cobble together 60 senators, including at least eight Democrats or independents, to agree to start debate on the legislation.

Sen. Lindsey Graham Lindsey Olin GrahamSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-S.C.) and a handful of Republicans — including GOP Sens. Jeff Flake Jeffrey (Jeff) Lane FlakeRepublican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style Bush endorsing Biden? Don't hold your breath MORE (Ariz.), Lisa Murkowski Lisa Ann MurkowskiSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (Alaska) and Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE (Nev.) — have been working on bills this year to allow undocumented immigrants who entered the country as children to, at least temporarily, remain in the country legally.

Hundreds of thousands of undocumented immigrants have been granted temporary reprieves from deportation under the Obama-era Deferred Action for Childhood Arrivals program. But it does not confer legal status on immigrants.

Cotton and Perdue would need to win over their votes, as well as Sen. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE. The Arizona Republican, who is currently undergoing cancer treatment, was critical of their earlier bill.

The White House roll out could give the legislation a boost of momentum, but the earlier version of the Cotton-Perdue bill garnered zero cosponsors.

Critics of the measure say it would devastate families’ effort to reunite with their overseas relatives while providing few economic benefits.

“If this is an acknowledgement that our immigration system is broken, the Trump administration and these senators are right, but this is the wrong way to fix it,” said Ali Noorani, executive director of the National Immigration Forum. “Cutting legal immigration for the sake of cutting immigration would cause irreparable harm to the American worker and their family.”

"Congress should focus on stopping illegal immigration – not on restricting the legal immigration that grows our economy," said John Feinblatt, president of the former New York City Mayor Michael Bloomberg-backed group New American Economy.

–– This report was last updated at 1:07 p.m.