US President Donald Trump holds a chart as he delivers remarks on reciprocal tariffs during an event in the Rose Garden entitled "Make America Wealthy Again." (Getty Images)
Examples Greer cited for Capitol Hill aides included both Brazil and the European Union, while stressing that exemptions would be made for foreign products already subject to U.S. penalties — rather than double up on the taxes.
While political communications offices often hold coordinated messaging calls on important issues, a source familiar with the matter told Fox News Digital that it was the first such communications policy call between this White House and House Republican staff.
It underscores tariffs' importance in the Trump administration's policy platform, as the White House works to ensure the GOP is in lock-step on its messaging.
When reached for comment by Fox News Digital, a White House official emphasized that the Trump administration has been the most transparent in history, and that the president wants to ensure his allies are armed with the most up-to-date information.
And while the vast majority of Republicans are praising Trump's moves, some GOP lawmakers have conceded to at least some concerns.
"I think tariffs that are equal to what they're charging are defensible. We want a level playing field," Rep. Don Bacon, R-Neb., told Fox News Digital on Wednesday evening. "The automobile one can be messy because the parts are from all over."
Meanwhile, Sen. Susan Collins, R-Maine., spoke out in support of a Democratic bid to exempt Canada from tariffs on the Senate floor Thursday, hours before Trump's formal announcement.
A number of Republican lawmakers were at the White House in support of the announcement on Thursday, including Speaker Mike Johnson, R-La. (J. Scott Applewhite/AP Photo)
"President Trump is sending a clear message with Liberation Day: America will not be exploited by unfair trade practices anymore," Johnson said in a public statement. "These tariffs restore fair and reciprocal trade and level the playing field for American workers and innovators. The President understands that FREE trade ONLY works when it’s FAIR!"
CLICK HERE TO GET THE FOX NEWS APP
Rep. Andy Biggs, R-Ariz., a close Trump ally, wrote on X, "President Trump’s reciprocal tariffs are a brilliant economic strategy. Joe Biden left the United States with a whopping $1.2 trillion trade deficit at the end of his regime."
Fox News Digital also reached out to the Office of the U.S. Trade Representative for comment but did not immediately hear back.
Trump's plan involves a 10% blanket tariff on all foreign imports into the U.S., as well as tariffs up to 50% on both adversaries and allies.
It also introduces some level of reciprocal tariffs on countries that tax U.S. exports, though in most cases, the U.S. rate is lower than the foreign country's.
Elizabeth Elkind is a politics reporter for Fox News Digital leading coverage of the House of Representatives. Previous digital bylines seen at Daily Mail and CBS News.
Follow on Twitter at @liz_elkind and send tips to elizabeth.elkind@fox.com
https://www.foxnews.com/politics/white-house-rallies-house-republicans-trump-tariff-plan-secret-call