WASHINGTON, Dhu-AlHijjah 24, 1436, October 08, 2015, SPA -- U.S. Democratic presidential candidate Hillary Clinton will propose a tax on high-frequency trading, her campaign said late Wednesday, according to Reuters. The tax would target securities transactions with excessive levels of order cancellations, which destabilize the markets, a campaign aide said. "The growth of high-frequency trading has unnecessarily burdened our markets and enabled unfair and abusive trading strategies," the aide said. --SPA 02:25 LOCAL TIME 23:25 GMT www.spa.gov.sa/w