There are no guarantees that the candidates on the Republican side of the aisle will win the election.
The 2016 election was fought on a razor-thin margin, with less than 40 percent of precincts reporting.
But that is not because Republicans are not competitive.
Trump won the election with nearly 80 percent of the vote.
In 2012, Mitt Romney won with just over 60 percent of voters, and President Barack Obama won the popular vote with less that 55 percent.
That makes the election a tossup.
The problem is, a lack of support for the establishment candidates is not an anomaly.
Republican voters are increasingly divided over the party’s nominees, and the results could be the tipping point that sends Trump over the edge.
In the past month, at least 13 Senate races have come down to the wire.
And at least five have been close.
Here are the top five Senate races to watch:1.
Sen. Jeff Flake of Arizona: If the election were held today, Flake would be the Republican nominee for the Senate, a job he held until last year.
Flake has been an outspoken opponent of President Donald Trump and his policies, but the Arizona senator has been reluctant to commit to any of his colleagues in the Senate if the president is elected.
Flake is a moderate who has supported the president on multiple issues, including on immigration, trade and infrastructure.
The Arizona senator is also viewed favorably by many conservatives, but he faces a formidable opponent in Rep. John Culberson.
Trump is also expected to win the state in November.2.
Sen of South Dakota: Sen. Lindsey Graham of South Carolina has won the Democratic nomination for the seat he is seeking in 2018.
Graham has been a staunch supporter of Trump’s policies and has been among Trump’s most vocal critics in Congress.
He has supported some of the president’s signature legislative initiatives, including the repeal of the Affordable Care Act and tax cuts for the wealthy.
But he has been less than enthusiastic about Trump’s agenda, which includes a $1 trillion infrastructure bill.3.
Sen from Maine: Sen Jeff Merkley of Oregon has won his seat in 2018, and he is widely seen as the establishment candidate.
Merkle is one of Trump and Trump’s closest allies, and a longtime Trump ally and adviser.
He is one the president has been calling a “good friend” for years.
Merko’s support for Trump has made him popular with Democrats.
He could be vulnerable if Trump is elected president.4.
Sen Robert Menendez of New Jersey: Menendez is the Democratic incumbent in the seat of New York Sen. Chuck Schumer.
Menendez, who has long been a critic of Trump, is a former prosecutor and has defended the president against a number of Trump-related charges.
Menenberg is widely viewed as a moderate Democrat and is expected to be one of the few senators who vote against Trump.5.
Sen Susan Collins of Maine: The first female Republican to hold the seat, Collins is expected in the race to represent Maine.
Collins is a staunch Trump critic and has expressed concerns about Trump administration policies.
She is also one of a handful of Senate Republicans who are expected to vote against any attempt to repeal the Affordable Health Care Act.