It takes one Senator and one Representative to issue the challenge. It'd take a majority in both houses to uphold it.
“It only takes one Senator and one Representative to challenge the electors and block the count.
It takes one Senator and one Representative to issue the challenge. It’d take a majority in both houses to uphold it.”
True. After a two hour debate, both Houses would be required to vote. Note: It only takes a majority of the members present, which is not necessarily the whole bodies.