The Family Dollar-Dollar Tree merger could be off the table if the deal does not gain approval at a shareholder meeting scheduled for Jan. 22.

Dollar Tree CEO Bob Sasser sent Family Dollar Chief Executive Howard Levine a letter on Friday that said it is “imperative” for the shareholder vote to be held to eliminate uncertainty that is damaging Family Dollar’s (NYSE:FDO) business and because Dollar Tree’s (NASDAQ:DLTR) financing costs go up after that date.

Read: Family Dollar CEO: Merger turmoil…