Congress has two bodies: The House of Representatives and the Senate.
Members of the House of Representatives are called Representatives.
Members of the Senate are called Senators.
BOTH are called Congressmen.
You stated, “The headline is incorrect. Mark Meadows is a “Congressman”, not a “Senator”.,P> Well, actually, you’d be incorrect, too.”
The current edition of Webster’s dictionary defines Congressman as follows:
“: someone (especially a man) who is a member of a congress and especially of the U.S. House of Representatives”
Technically a Senator is a member of Congress and could be called a Congressman. In practice, as Webster indicates, members of the House are called Congressmen.
Members of the Senate do not refer to themselves as Congressmen and are rarely referred to as a Congressman by the media. Members of the US Senate are almost always referred to as a “Senator”.