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Senator John McCain returned to Washington D.C. to vote on health care reform today, five days after announcing that he is battling brain cancer. McCain's return could help Majority Leader Mitch McConnell garner enough votes to pass a motion calling for a debate on the health care bill. President Trump tweeted: "Big day for HealthCare. After 7 years of talking, we will soon see whether or not Republicans are willing to step up to the plate!" – NPR

The U.S. National Institute of Allergy and Infectious Diseases (NIAID) and Johnson & Johnson are developing an HIV vaccine that could protect against multiple strains of the virus at once. Using algorithms, researchers have taken markers from several HIV strains and used them to cobble together a "mosaic vaccine." A preliminary clinical trial with 393 volunteers showed that the vaccine triggered anti-HIV immune responses in all the participants. This is only the fifth time that researchers have tested an HIV vaccine in people. – VOX

The Senate Judiciary Committee has issued a subpoena to get one-time Trump campaign manager Paul Manafort to testify on Wednesday. Senators want to ask Manafort about a meeting last year with a Russian attorney who had offered Donald Trump Jr. information that could potentially damage Hillary Clinton's campaign. Manafort, Donald Trump Jr. and President Trump's son in law, Jared Kushner, took part in the meeting. This story is developing. – POLITICO

The moon’s interior could contain large amounts of water, new research indicates. Using satellite images, a group of scientists at Brown University discovered that nearly all of the volcanic deposits in the moon contain small traces of water. These pyroclastic deposits cover thousands of square kilometers and may be several kilometers deep, said the study’s lead author, Ralph Milliken. This means that, in theory, water could be extracted from the moon’s mantle, Milliken said. The research was published in the journal Nature Geoscience. – CNN

Israel will remove metal detectors from a holy site in Jerusalem that were fiercely opposed by the Palestinian community. The Israeli government will instead allocate extra officers and invest some $28 million in security equipment to protect the site, which is known to Jews as the Temple Mount and to Muslims as Haram al-Sharif. Israel set up the metal detectors after two Israeli police officers were killed at the site earlier this month. Israeli authorities argued that the detectors were necessary because the men blamed for the attack had smuggled weapons into the site. But thousands of Palestinians took to the streets to protest the decision, which led to clashes with Israeli security forces that left three Palestinians dead on Friday. – BBC

Singer-songwriter Alice Cooper has found a long-forgotten Andy Warhol silkscreen that had been put away with his touring equipment in a storage space. The red-tainted painting is based on a press photograph featuring an electric chair in a death chamber. The singer’s manager, Shep Gordon, said that in 1972 he gave $2,500 to Cindy Lang, Cooper’s girlfriend at the time, to acquire the painting. A green version of Little Electric Chair fetched $11.6 million at an auction in 2015. However, Cooper’s canvas is unlikely to be worth as much because it doesn't bear Warhol's signature. – GUARDIAN

A Federal judge in Detroit has halted the deportation of some 1,400 Iraqis. The decision stems from an injunction filed by civil rights lawyers who argue that the Iraqis face persecution in their home country. The ruling means that the immigrants can now challenge their deportation orders in the courts. "Those who might be subjected to grave harm and possible death are not cast out of this country before having their day in court," U.S. District Judge Mark Goldsmith wrote in his order. – REUTERS

Justin Bieber has canceled the remaining 14 concerts of his Purpose World Tour. The Canadian singer, 23, was due to play in Los Angeles, New York, Minneapolis and Boston, as well as in Toronto, before heading to Asia. A statement from the singer's representative said the cancelation was due to "unforeseen circumstances." However, a source told People that Bieber decided to cancel the rest of the tour because he is exhausted. So far the tour has included 150 shows across the world over the course of 18 months. – PEOPLE

Some 50 workers from Three Square Market, a tech company in Wisconsin, have agreed to have microchips implanted into their hands. The size of a grain of rice, the microchips will allow the workers to buy snacks during their break, open doors, login to computers, and make photocopies. The chips, which use near-field communications, will be implanted between the thumb and the forefinger. Three Square Market’s CEO Todd Westby said participation in the program is voluntary. The tech company special...