Falsely accusing a former President of breaking the law should be an impeachable offense. If you make a false police report you are breaking the law... it shouldn't be any different for Trump. Period.
Exactly
Amendment 25
4. Whenever the Vice President and a majority of either the principal officers
of the executive departments or of such other body as Congress may by law
provide, transmit to the President pro tempore of the Senate and the Speaker of
the House of Representatives their written declaration that the President is
unable to discharge the powers and duties of his office, the Vice President
shall immediately assume the powers and duties of the office as Acting
President.
Thereafter, when the President transmits to the President pro tempore of the
Senate and the Speaker of the House of Representatives his written declaration
that no inability exists, he shall resume the powers and duties of his office
unless the Vice President and a majority of either the principal officers of
the executive department or of such other body as Congress may by law provide,
transmit within four days to the President pro tempore of the Senate and the
Speaker of the House of Representatives their written declaration that the
President is unable to discharge the powers and duties of his office. Thereupon
Congress shall decide the issue, assembling within forty eight hours for that
purpose if not in session. If the Congress, within twenty one days after
receipt of the latter written declaration, or, if Congress is not in session,
within twenty one days after Congress is required to assemble, determines by
two thirds vote of both Houses that the President is unable to discharge the
powers and duties of his office, the Vice President shall continue to discharge
the same as Acting President; otherwise, the President shall resume the powers
and duties of his office.