The day before next Tuesday's election, he will hold three rallies: one each in Cleveland; Fort Wayne, Indiana, and Cape Girardeau, Missouri.
Over 3 million people have already voted by mail and returned their ballots, or voted early.
The FiveThirtyEight House poll that analyzes all the major 2018 election polls to provide a statistical probability of the Democrats flipping 23 Republican seats to gain control of the House, now predicts a 86.4 percent chance the Democrats will win a majority, with an estimated net gain of 40 Congressional seats.
Saturday afternoon, Harris and Newsom will join comedian Chelsea Handler in Orange County to support Democrat UC Irvine Law Professor Katie Porter running in the 45th congressional district to flip the seat held by five-term Republican Rep. Mimi Walters.
In the closing days of Florida's high-stakes races for governor and USA senator, President Donald Trump and former President Barack Obama will try to rally the Republican and Democratic faithful in the state.
Merkel's party dealt electoral blow: What you need to know
Mrs Merkel has been chair of the CDU since 2000, becoming one of its longest-serving chairpersons. The chancellor of Germany is usually-but not always-the leader of his or her party.
Democrats can afford to spend a lot of money in close districts for the next 7 days, Republicans can't.
The stakes for President Trump are extremely high since a Democratic victory in either chamber would give the party the power to open investigations into various aspects of his administration.
Trump will travel to Missouri, West Virginia, Montana, Indiana, Ohio, Georgia, Tennessee and Florida in the final days before the November 6 vote, the official said.
And Republican candidate Bill Schuette says he's got his own campaign stops planned.
"In the final six days, the president will have 11 rallies around the United States", the official said on Monday.
Trump plans a heavy schedule of campaigning and fundraising through the midterm elections.