This is not the first time we've had these debates.

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There's already a prohibition against foreign money interfering in elections.

So this wouldn't be a foolproof method, but there'd be the expectation that the social media companies would make a good-faith effort.

What we're trying to do is provide the lightest touch possible that is not going to slow innovation and invade anyone's First Amendment rights.

But you are right that this in and of itself will not solve all problems.

He'll be looking to better understand how foreign agents working on behalf of Russia were able to spread disinformation on these social networks during the 2016 presidential campaign.

The execs will be testifying at three separate congressional hearings Tuesday and Wednesday.

Below is an edited transcript of the conversations in which he acknowledges the limitations of his proposed legislation and warns that big companies like Facebook and Twitter need to be doing more to address the issue of Russian interference in US elections. You may have ads that point to a site, and that site might be a fake site.

And if the site or account is fake we might not scoop that up in this legislation.

Warner: I think they're all moving in the right direction. Frankly, their initial reaction to Russian involvement has been a bit embarrassing. The proof will be in the pudding in terms of what they say and present on Nov. Warner: I'm interested to see how forthcoming they'll be.