J Street has launched a campaign in support of Washington's firm stance on Israel's latest approved building plan in East Jerusalem, the dovish U.S. pro-Israel lobby announced on Tuesday. Israel's announcement of plans to build 1,600 housing units in East Jerusalem strained ties with the U.S., which has said it regarded last week's decision - made public while Vice President Joe Biden was in Israel - as an insult. Recent U.S.-Israel tensions were used by "hawkish pro-Israel activists," according to the announcement posted on J Street's website, "to attack the Obama Administration over Israel, urging the Administration to slow down...