A grassroots political support group backing President Barack Obama is joining a Republican pro-immigration organization and an effort run by New York Mayor Michael Bloomberg to push for a comprehensive immigration bill using social media platforms.

Organizing for Action, a grassroots group run by Obama loyalists that grew out of his 2012 re-election campaign, will co-sponsor a "virtual march on Washington" planned for next week aimed at getting people to use social media platforms to register their support for the immigration legislation.

Bloomberg's Partnership for a New American Economy is behind the effort. Republicans for Immigration Reform, a group headed by former Bush administration Commerce Secretary Carlos Gutierrez, also is co-chairing the endeavor.

"By bringing together leaders from both parties and Americans across the country, we hope to send Congress a clear message that there is broad support for smart reform — and the time for action is now," Bloomberg said in a statement.

The virtual "March for Innovation," planned for May 22-23, is designed to get people to use Twitter, Reddit, Facebook and other social media platforms to push Congress to pass the immigration bill, which may come to a vote next week in the Senate Judiciary Committee.

It's another sign of engagement by business and high-tech leaders and officials across the political spectrum to support the immigration legislation.

Meanwhile, legal immigration is the focus as the Senate Judiciary Committee resumes the work of amending legislation overhauling the U.S. immigration system.

Amendments expected to be offered Tuesday could reshape a painstakingly negotiated deal between business and labor on a visa program for lower-skilled workers. Attention will be on the four senators on the committee who are among the bill's eight authors to see whether they can stick together to fend off the changes.

There's also a dispute over provisions in the bill dealing with high-skilled workers.

And the committee may make changes to address shortcomings in the student visa program after the Boston Marathon bombings. A foreign student accused of hiding evidence was allowed to return to the U.S. in January without a valid student visa.

Based on reporting by The Associated Press.

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