Democrats to pair stopgap spending with debt ceiling increase, testing Republican opposition.

Democratic congressional leaders announced on Monday that they will pair a stopgap spending bill to keep the government funded though December with an extension of the federal borrowing limit through the end of 2022, increasing pressure on Republicans to support legislation needed to avert a fiscal catastrophe.

Senator Mitch McConnell, Republican of Kentucky and the minority leader, and a majority of his party have vowed to withhold their support for raising the debt ceiling under a Democratic-controlled government, arguing that it is the ruling party’s responsibility to finance the federal spending they...