The Venetian Casino Resort in Las Vegas has filed a lawsuit against Tennessee-based Tea Party Nation for allegedly failing to pay a more than $600,000 bill.

The Las Vegas Review Journal reported that the hotel claims the tea party group owes money for a five-day convention it canceled at the hotel last summer.

The Tea Party Nation reserved 1,637 room nights in the Palazzo hotel, according to court documents. The tea party group cancelled two weeks before the event.

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The group agreed to pay the hotel $579,148 in the event of a cancellation and $87,996 in interest has since been added to that amount.

The Venetian’s lawyers claim the Tea Party Nation “has refused, and continues to refuse, to make payment,” despite being contacted numerous times, LA Weekly reported.

Tea Party Nation Founder Judson Phillips told Las Vegas Review Journal that hasn’t seen the lawsuit yet.