Johnson, a hard-line conservative, voted against security assistance for Ukraine in September, but since becoming House speaker has been more receptive to funding the country's military, warning that Russian President Vladimir Putin cannot be allowed to prevail.

A classified briefing on the war in Ukraine has fallen apart as some Republicans walked out in protest over the lack of immigration policies included in the supplemental aid package.

Republicans are demanding immigration measures in exchange for supporting Democrats’ foreign-assistance package.

A procedural vote on Ukraine aid is expected to fail after Republicans walked out of a briefing amid an unrelated immigration policy spat.

WASHINGTON—House Speaker Mike Johnson (R., La.) said Republicans need broad changes to U.S. border and immigration policy as a condition for joining Democrats to pass tens of billions of dollars in aid sought by Ukraine in its war against Russia.