GOP lawmakers who visited the White House on Wednesday were surprised to walk into President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's announcement on reducing tariffs with the European Union.

A group of lawmakers told ABC News that they were supposed to meet with Trump about trade, but instead the president pulled them into the Rose Garden event with European Commission President Jean-Claude Juncker.

“The word that we got from staff was, as it was coming together, [Trump] was saying, ‘OK, what’s the next meeting?'" Sen. James Lankford James Paul LankfordMcConnell works to lock down GOP votes for coronavirus bill Charities scramble to plug revenue holes during pandemic Warren calls for Postal Service board members to fire DeJoy or resign MORE (R-Okla.) told ABC. "And they said, 'Mr. President, the next meeting is with senators and House members,' and he said, 'Well, just bring them on out to hear this because they'll want to hear it.'"

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The group of senators and House members, most of whom are from agricultural states, planned to warn Trump against his aggressive trade policies.

Trump in recent weeks has slapped billions of dollars in tariffs on products from countries including China, Mexico and Canada, as well as the EU.

During the announcement on Wednesday, Trump announced he and Juncker had agreed "to work together toward zero tariffs, zero non-tariff barriers and zero subsidies on non-auto industrial goods," indicating a reduction in tension.

Trump is reading the list of lawmakers he was supposed to meet with in the Cabinet Room at 4pm. They now instead appear to be attending his joint statement with Juncker in the Rose Garden. — Rebecca Ballhaus (@rebeccaballhaus) July 25, 2018

Though it appeared to some onlookers that the Republican lawmakers were attending the announcement with prior knowledge of its content, they confirmed to ABC that they did not know what it was going to be about.

A number of GOP lawmakers in the Rose Garden too for upcoming @realDonaldTrump press event with EU Commission President — Kelly O'Donnell (@KellyO) July 25, 2018

“We arrived there, and then we became eye candy,” Senate Agriculture Committee chairman Sen. Pat Roberts Charles (Pat) Patrick RobertsThe Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill GOP senators say coronavirus deal dead until after election MORE (R-Kan.) said.

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The lawmakers said they wanted to discuss the Trump administration's recent offer to provide $12 billion in aid for farmers affected by other countries' retaliatory tariffs. They said they wanted Trump to roll back tariffs rather than provide government aid, ABC reported. Farm groups have also expressed concern.

"Our sense is the dominoes can’t start falling until the first one starts falling, but there are so many deals in the air right now that if you’re going to redo trade negotiations, you’ve got to have a beginning point," Lankford said.

Agriculture has been one of the hardest hit industries following Trump's tariffs.