The leader of a House bid to challenge the Electoral College election of Joe Biden said that he is “cautiously optimistic” of winning the needed support in the Senate to fight on despite Majority Leader Mitch McConnell’s urging to have President Trump step aside.

Alabama Rep. Mo Brooks said he expects the support of at least one senator when he moves next month to challenge the electoral votes of several states in which the Trump campaign has claimed election fraud. Without a Senate ally, the effort fails.