Question

Which of these actions is forbidden by the Constitution?

creating a law ex post facto
borrowing money from the government
passing “necessary and proper” laws
regulating trade with foreign countries

Answer 1

Creating a law ex post facto.

The Constitution forbids ex post facto laws (Art. I, Sec. 9 for Congress; Sec. 10 restricts the states). The other actions (borrowing money, passing necessary-and-proper laws, and regulating foreign trade) are powers granted to Congress.