Tamar Zandberg called ‘human trash’ and ‘filth’ over her participation in IfNotNow demonstration in Washington By Times of Israel staff Meretz MK Tamar Zandberg speaks at a rally in support of legalizing marijuana in Tel Aviv on February 4, 2017. (Tomer Neuberg/Flash90) A left-wing Israeli lawmaker invited to Washington by the pro-Israel lobby to participate in…