Senate Republican leaders spent a rare Sunday session scolding Ted Cruz.

The leaders wagged their fingers at the younger senator, accusing him of using his pedestal in the upper chamber to “pursue personal ambitions.”

Cruz, a Texas senator who is running for the Republican presidential nomination, drew the ire of his colleagues for claiming the top Republican in the Senate lied to him. He accused Senate Majority Leader Mitch McConnell (Ky.) of going back on a promise he claims McConnell made to him about the contentious Export-Import Bank.

On Friday, McConnell set up an amendment vote to reauthorize the bank, which provides loans to those purchasing American exports. That didn’t sit well with Cruz — a strong opponent of the bank — who said he could not “believe [McConnell] would tell a flat-out lie.”

In an attempt to get a vote on additional amendments to legislation currently before the Senate, Cruz utilized a procedural tool to overturn McConnell’s decision to “fill the tree” on amendments. By filling the tree, McConnell is able to control more closely which amendments get a vote, and limit the amount.