Only if the US Constitution prohibits recall. AFAICS, it does not and the Tenth Amendment applies. Alaska, Arizona, California, Colorado, Georgia, Idaho, Kansas, Louisiana, Michigan, Minnesota, Montana, Nevada, New Jersey, North Dakota, Oregon, Rhode Island, Washington, and Wisconsin are the states with some manner of recall availability on their books.
The Constitution sets the senate term at 6 years. There is nothing in it that says '6 years unless...'. Recall of a Senator is unconstitutional. The 10th Amendment doesn't apply.
Alaska, Arizona, California, Colorado, Georgia, Idaho, Kansas, Louisiana, Michigan, Minnesota, Montana, Nevada, New Jersey, North Dakota, Oregon, Rhode Island, Washington, and Wisconsin are the states with some manner of recall availability on their books.
State officials only.
The Constitution specifies how elected officials may be removed.
Recall is not listed.
In 224 years, there has never been a recall of an elected federal official -- for a reason.