Five more rallies are scheduled for today, culminating in a return to Michigan

Frenetic racing: contention in the main battlefield states may be tightening in the race for tomorrow's elections 

With Joe Biden maintaining strong national leadership, 74-year-old President Trump held four separate rallies on Saturday in Pennsylvania - which both sides see as a mandatory victory - and five more in other key states yesterday, including Iowa and Georgia, where he won comfortably in 2016 but will be much closer this time.