Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event.
Hillary Clinton is the wife of former United States president Bill Clinton while Donald Trump is married to former model, Melania Trump, his third wife.
Republican presidential nominee Donald Trump shakes hands with Democratic presidential nominee former Secretary of State Hillary Clinton during the town hall debate at Washington University on October 9, 2016 in St Louis, Missouri.
Republican presidential candidate Donald Trump sits with his wife Melania Trump while appearing at an NBC Town Hall at the Today Show on April 21, 2016 in New York City.
Democratic presidential candidate Hillary Clinton raises her arms stands on stage during the New Hampshire Democratic Party Convention at the Verizon Wireless Center on September 19, 2015 in Manchester, New Hampshire.
Democratic presidential nominee Hillary Clinton shakes hands with husband and former U.S. President Bill Clinton after the second 2016 Presidential Debate at Hofstra University in Hempstead, New York.
Hillary Clinton is the wife of United States' 42nd president Bill Clinton while Barack Obama is the 44th U.S. president.
Presidential candidate Rodrigo Duterte, who eventually became the 16th president of the Philippines, casts his vote inside a polling precinct on May 9, 2016 in Davao city, Philippines.
President-elect Rodrigo Roa Duterte and outgoing president Benigno Aquino III salute presidential honor guards during the inauguration at Malacanang Palace on June 30, 2016 in Manila, Philippines.
Meryl Streep takes a photo of herself with U.S. Secretary of State Hillary Clinton following a dinner for Kennedy honorees hosted by U.S. Secretary of State Hillary Rodham Clinton at the U.S. Department of State on December 1, 2012 in Washington, DC.

Both Donald Trump, 70, and Hillary Clinton, 69, agree that the United States should take it slowly when it comes to winding down the war on drugs. On the issue of war drugs, Philippine president Rodrigo Duterte, 71, appears to be the most controversial among all leaders in the world today.

Like Us on Facebook

On Oct. 15, Saturday, Trump was in a rally in Portsmouth, New Hampshire. The Republican candidate challenged Clinton to take a drug test before the third and final U.S. presidential debate, which will be held on Oct. 19 at the University of Nevada in Las Vegas.

"I think we should take a drug test prior to the debate because I don't know what's going on with her," CNN quoted Trump as saying, referring to Clinton during the rally in Portsmouth. "But at the beginning of her last debate, she was all pumped up at the beginning, and at the end it was like, huff, take me down. She could barely reach her car."

Trump did not offer any evidence to back up his claim against his Democratic opponent. Apparently, the former host of "The Celebrity Apprentice" confused the second presidential debate with the 9/11 ceremony on Sept. 11 in New York City, where a bout of pneumonia forced Clinton to require assistance while getting into her van.

On the other hand, Duterte is set to visit a drug rehabilitation center in China. On Oct. 14, Friday, Chinese Ambassador to the Philippines Zhao Jianhua said the Filipino president will go to Beijing where he will visit a traffic control center.

"The President has never mentioned the Great Wall," Rappler quoted Zhao as saying when asked if Duterte has requested to visit specific places like the Great Wall of China. "He asked about whether there is a rehabilitation center in Beijing, and he also asked about whether we have a center of traffic control in Beijing."

While apparently building stronger ties with China, Duterte slammed U.S. President Barack Obama, 55, for criticizing the Philippine war on drugs. It has yet to be seen if the next U.S. president, be it Trump or Clinton, exerts an effort to be on the same page with Duterte on the issue of war on drugs.

Meanwhile, watch Clinton's recent interview with Ellen DeGeneres here: