(CNN) — Top telecom executives met with US national security officials at the White House on Friday as concerns mount over a long-running Chinese cyber-espionage campaign that has targeted some of the most senior US political figures in the country. The meetings were a chance for telecom executives to advise the government on how it could boost its defenses against sophisticated hacks, according to the White House. The hack is shaping up to be one of the biggest cyber and national security challenges facing the incoming Trump administration. But the full scope of the hack, who it affects and its impact on national security are still being investigated. US officials and private cyber experts are keeping a running tally of the number of telecom firms breached.

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Persons: Trump, ” Sen, Mark Warner, Donald Trump, JD Vance, Jared Kushner, Eric Trump, Edward Snowden, Christopher Wray, ” Morgan Adamski, Adamski Organizations: CNN, — Top, US, White, Democrat, FBI, Warner, Verizon, Lumen, Republican, Democratic, National Security Agency, US Cyber Command, Cyber Command Locations: Virginia, Washington, DC, China, Taiwan, Arlington , Virginia