Yes, but Congress may not be able to decide.

• If the contest doesn’t produce a majority (50% +1) of the votes of seated Electors by
Jan. 6, there are clearly established Constitutional procedures to determine a victor.
• There are two areas of uncertainty at the late stage of a contested election:

-Each house determines the final election results of its membership. This
means that the Democratic majority in the U.S. House might decide not to seat
duly elected Republican Members so as to prevent the Republicans from
holding a 26-seat majority in the state delegations in the event that state
delegations, each with one vote per state, are used to determine the President
in the event that no candidate has the needed absolute majority of seated
Electors’ votes. Given that the majority’s power to determine the membership
of the body, House or Senate, is absolute, the sole check on the use of this
absolute political power is the potentially dire consequences of its abuse.

-Should the results be undetermined through Jan. 20, Inauguration
Day, the Succession Act would suggest that the Speaker of the House would
become acting President until one is determined and, if the House cannot
decide, then elevating the Vice President, even if selected out of the Senate.