Conservatives in Washington are growing much more leery of groups with financial ties to Big Tech.

Driving the news: The American Principles Project, a conservative advocacy group, will send a letter today warning Republican lawmakers and staffers to be aware of third-party lobbyists who receive funding from Big Tech in an attempt to "influence public policy on the Right" and "coopt the Republican party."

Why it matters: Third-party influence is a key lobbying strategy for major companies in Washington and has in the past been very effective for Silicon Valley. Now it's becoming a...