Donald Trump has maintained a national lead over Hillary Clinton for the second straight day in a new Rasmussen poll that showed him trailing by seven on Monday. He now leads her 43 percent to 41 percent.

And one of the more important statistics from this poll is that 87 percent now say they are certain how they will vote in this year’s presidential election, and among those voters, Trump leads 48 percent to Clinton's 46 percent.

Trump also earns 77 percent of the GOP's support, while Clinton carries 76 percent of her own party.

But most Republican voters still think the Republican establishment is hurting the party with their continuing criticism of Trump and are only slightly more convinced that those leaders want Trump to be president.

Republicans are becoming more and more likely to side with Donald Trump in November rather than the Washington establishment.