The two major candidates in this November's US presidential election are set to face off for their first televised debate. As many as 100 million Americans are expected to watch Democrat Hillary Clinton and Republican Donald Trump go head-to-head debating the key issues.

Hillary Clinton and Donald Trump head into this debate with the latest U.S. poll showing them deadlocked in a virtual tie.

About three weeks ago, they presented their foreign policy ideas, separately, at a televised forum. Now they'll debate them face-to-face.

Clinton took a few days off the campaign trail to prepare.

"They say she has been practicing debate, I think she is slipping," Donald Trump said.

"When the spotlights are at their brightest and the pressure is at its most intense that's when she brings the A-plus game," said Tim Kaine, Democratic Vice Presidential Candidate.

Both candidates met with Israeli Prime Minister Benjamin Netanyahu. Clinton also met with Japanese Prime Minister Shinzo Abe. Tokyo officials say Abe urged her to support the Trans-Pacific Partnership trade agreement, a trade deal she once backed, but now opposes.

If elected, Trump has promised to reject the deal which covers 40 percent of the global economy.

Ukrainian President Petro Poroshenko also met with Clinton in New York and invited Trump who failed to show up.

Trump has expressed admiration for Russian President Vladimir Putin, and told a reporter that Putin would not invade Ukraine-even though many Western governments believe he already did in Crimea.

Both candidates met with Egyptian President Abdel Fattah Al-Sisi, a key ally in the coalition fight against ISIL.

After a series of terrorist bombings in New York City and New Jersey - how to prevent ISIL-inspired terror in the U.S. - is likely to come up in the debate.

Earlier this month Clinton released a 9-thousand-word plan to defeat ISIL. Donald Trump says he wants his plan to remain secret. It's still is.