President Joe Biden on Friday pressed Congress to embrace a bipartisan Senate deal to pair border enforcement measures with Ukraine aid, but House Speaker Mike Johnson suggested the compromise on border and immigration policy could be "dead on arrival" in his chamber.

The Democratic president said in a statement late Friday that the policies proposed would "be the toughest and fairest set of reforms to secure the border we've ever had in our country." He also pledged to use a new emergency authority to "shut down the border" as soon as he could sign it into law.

Biden's embrace of the deal — and Republican resistance — could become an election-year shift on the politics of immigration. Yet the diminishing prospects for its passage in Congress may have far-reaching consequences for U.S. allies around the globe, especially Ukraine.

Senate Republicans had initially insisted that border policy changes be included in Biden's $110 billion emergency request for funding for Ukraine, Israel, immigration enforcement and other national security needs. But the Senate deal faced collapse this week as it came under fire from Republicans, including Donald Trump, the likely presidential nominee, who eviscerated the deal as a political "gift" to Democrats.

Johnson, a Louisiana Republican, on Friday sent a letter to colleagues that aligns him with hardline conservatives determined to sink the compromise. The speaker said the legislation would have been "dead on arrival in the House" if leaked reports about it were true.

A core group of senators negotiating the deal were hoping to release text early next week, but conservatives already say the measures do not go far enough to limit immigration. The proposal would enact tougher standards on migrants seeking asylum as well as deny asylum applications at the border if daily migrant encounters grow to numbers that are unmanageable for authorities.

"Rather than accept accountability, President Biden is now trying to blame Congress for what HE himself intentionally created," Johnson said in the letter.