WASHINGTON/NEW YORK (Reuters) - President Barack Obama on Sunday called on Silicon Valley to help address the threat of militant groups using social media and electronic communications to plan and promote violence, setting up renewed debate over personal privacy online.

U.S. President Barack Obama speaks about counter-terrorism and the United States fight against Islamic State during an address to the nation from the Oval Office of the White House in Washington, December 6, 2015. REUTERS/Saul Loeb/Pool

“I will urge high-tech and law enforcement leaders to make it harder for terrorists to use technology to escape from justice,” Obama said in a televised Oval Office speech.

Obama used the address to try to reassure Americans nervous about possible future attacks after the shooting deaths of 14 people at an office party in San Bernardino, California, by a husband and wife with radical Islamist views.

The shootings have reinvigorated a long-running debate about Washington’s digital surveillance effort to find and capture violent extremists, with at least one sign of Republican support in the House of Representatives for Obama’s agenda.

The Republican-led House Foreign Affairs Committee will consider legislation on Wednesday calling for more details from Obama on a strategy “to combat terrorist use of social media.”

Committee Chairman Ed Royce said in a statement: “If we’re going to prevent additional attacks, President Obama is going to have to lay out the broad, overarching strategy. ... And in the House, we’re committed to providing the support needed.”

The White House wants tech firms to help by restricting the use of social media for violent ends, a senior administration official said on Sunday, speaking on background.

In coming days, the White House will talk to companies in the tech sector about developing a “clearer understanding of when we believe social media is being used actively and operationally to promote terrorism,” said the official.

Obama sees the need for the sector to work with law enforcement when the use of social media “crosses the line” from expressing views “into active terrorist plotting,” the official said.

“That is a deeply concerning line that we believe has to be addressed. There are cases where we believe that individuals should not have access to social media for that purpose,” the official said.

There have also been calls to weaken encryption to make it easier for the government to monitor communications. That idea has met fierce opposition from technology companies and privacy advocates, who warn that weaker encryption would expose data to malicious hackers and undermine the Internet’s integrity.

The White House wants to keep talking to Silicon Valley about encryption, saying U.S. allies in Europe and elsewhere “want to make sure that encryption is not utilized in a way that allows for a space, a dark space, for terrorist groups to be plotting operations and attacks,” the official said.

Some lawmakers were expected to revive legislation that would require social media sites such as Facebook and Twitter to inform the government about posts deemed to promote “terrorist activity.” (reut.rs/1IJM8kV).

CAMPAIGN ISSUE

The debate has also become part of the campaign for the November 2016 presidential election. On Sunday, Hillary Clinton, the front-runner in the Democratic race, said tech firms needed to stop groups from recruiting and directing attacks, and from celebrating violence.

“We’re going to need help from Facebook and from YouTube and from Twitter,” Clinton said on ABC’s “This Week.”

“They’re going to have to help us take down these announcements and these appeals,” Clinton said.

Twitter declined to comment on Clinton’s comments, and Facebook and Google did not immediately respond to requests for comment.

Current and former federal officials, Internet company executives and outside experts all told Reuters that Facebook, Twitter and YouTube had taken down more propaganda than ever before in the past year — on their own and in tandem with officials and activist groups.

“If there’s a broad trend, it’s that companies have become more willing to take things down that are somehow involved in terrorist recruitment or propaganda,” said Andrew McLaughlin, a former Google policy executive and deputy U.S. chief technology officer in Obama’s first term who is now executive chairman of the media sharing site Digg.