Some Connecticut Republicans said they would withhold support until a concrete proposal comes forward.

WSJ: Connecticut Weighing Driver's Licenses for Illegal Immigrants

And the introduction by the Gang of Six of a concrete proposal put forward by six members of the Senate -- three Republicans, three Democrats, representing a broad ideological spectrum in American politics -- I think is a welcome development.

WHITEHOUSE: Press Briefing

For example, PLAN NYC, the sustainability agenda for the eastern US concrete jungle, includes a proposal to ensure that all New Yorkers live within a 10-minute walk of a park.

BBC: Martha Schwartz