I don't believe they actually won the seats they claimed.  I mean we saw Dems lose on election night and somehow find thousands of additional votes in the subsequent days and weeks.  They stole those seats and POTUS/GOP let them because they were only concerned about the senate.    I thought about why they'd let them get away with such blatant fraud and decided they weighed how the Dems acted about Trump winning the presidency.  They freaked out and never recovered.  If we had won a strong majority in the senate and the congress, which I believe we did, they would have literally lost their minds and become uncontrollably violent.  I think POTUS was concerned about some of his supporters being hurt, and others of us engaging in civil war to repel the lunatics.