Formal:
* Congress is currently debating the new infrastructure bill.
* The President addressed a joint session of Congress last night.
* The Supreme Court ruled that the law passed by Congress was unconstitutional.
Informal:
* I wrote to my representative in Congress about the issue.
* Congress is struggling to find a solution to the budget crisis.
* The news reported that Congress passed a new tax bill.
Figurative:
* The party's internal squabbles resembled a miniature congress of opinions.
* The students formed a congress to discuss their concerns.
Remember: "Congress" always refers to the legislative branch of the United States federal government.