“the constitution gives Congress the sole right to determine the validity”
Actually it doesn’t. It gives each house the right to determine the validity of its *own* elections, but not that of the Presidential electors. Congress’s only role is to watch the count. The states determine the validity of the elections for Presidential electors. In fact there isn’t a requirement that there BE elections for Presidential electors but that last time that any state did not have such an election was 1860.
Why don’t you actually read the Constitution before further embarrassing yourself?