The House Intelligence Committee issued seven subpoenas on Wednesday, in a sign that its investigation into alleged Russian meddling in the 2016 election is ramping up in scope and intensity, according to people familiar with the matter.

The Republican-led committee issued four subpoenas related to the Russia investigation. Three subpoenas are related to questions about how and why the names of associates of President Donald Trump were unredacted and distributed within classified reports by Obama administration officials during the transition between administrations.