Which one of the following is NOT a power of the Senate?

The power of the Senate to impeach the President is a common misconception. In the context of impeachment, the House of Representatives holds the exclusive authority to impeach federal officials, including the President. This means that they can bring charges against a federal official, but the actual trial to determine if the impeachment leads to removal from office is held by the Senate.

Thus, the powers of the Senate include ratifying treaties, confirming Presidential appointments, and conducting impeachment trials, ensuring that the legislative branch provides a check on the executive branch. The Senate's role as the body that conducts impeachment trials underscores its function in overseeing the integrity of federal officials after they have been impeached by the House. Therefore, the correct answer illustrates a key distinction in the impeachment process: while the Senate has significant powers regarding impeachment, it is not responsible for the initial act of impeaching an official.