Leading congressional Republicans warned the Department of Homeland Security on Thursday not to delay updates to Congress on the state of the immigration crisis until after the election, and said that delay, if it is happening, would be “unacceptable.”

“[I]t has come to light through information provided to our Committees that the Department may have issued a directive to limit engagement with Congress until immediately before the election,” they wrote in a letter to DHS Secretary Jeh Johnson. “Any such directive, if issued, would be an unacceptable political ploy and a serious infringement of Congress’ oversight authority under the Constitution.”