The Obama administration will brief lawmakers on Syria in an unclassified teleconference call at 6pm Thursday.

Secretary of State John Kerry, Secretary of Defense Chuck Hagel, National Security Advisor Susan Rice, Director of National Intelligence James Clapper and deputy Chairman of the Joint Chiefs of Staff James A. Winnefeld Jr. are expected to be on the call, Hill sources said.

The briefing was originally going to be classified which would have required members not in Washington to travel to a federal building with a secure line.

But several lawmakers were apparently traveling and did not think they could get to a classified line, Hill sources say, and the briefing was changed to unclassified to accommodate them. Among those who didn’t think they could get to a classified line, Hill sources said, were Majority Whip Eric Cantor (R-VA), who was reportedly fundraising in North Dakota and Ohio Wednesday. (A spokesman for Cantor did not immediately respond to a query.) House Speaker John Boehner (R-Ohio) was traveling in Montana, but an aide said it was not the case that he could not get to a secure line for the Syria call. “Some other members may have had such an issue but it was not one for the speaker,” Brendan Buck, spokesman for Boehner, said by email Thursday.