As you probably know, it was Ruth Bader Ginsburg‘s last wish that her SCOTUS replacement not be nominated during the 2020 election year.
“My most fervent wish is that I will not be replaced until a new president is installed,” Ginsburg days before her death (source)
When President Obama first nominated Merrick Garland for the Supreme Court vacancy in March 2016, there was quite an outcry from Republicans to wait until after the election to fill Antonin Scalia’s empty seat. (Republicans refused to even grant Judge Garland a hearing some 8+ months before the 2016 presidential election.)