According to a Center for American Progress study, the House Intelligence Committee overlooked most of those contacts.

A study by Democratic-aligned Center for American Progress shows that officials within the Trump campaign had contact with Russia-linked operatives at least 70 times between January 2016 and Donald Trump's inauguration -- and 22 of those contacts were meetings.

But the House Intelligence Committee, led by Republicans, failed to fully investigate the vast majority of those contacts and subsequently concluded that no collusion had occurred between the Trump campaign and Russia.

Via NBC News:

According to the Center for American Progress’s Moscow Project, the House committee charged with investigating Russian involvement in the 2016 election obtained either no or incomplete information about 81 percent of the known contacts between Trump officials and Russians, or groups and individuals with strong Russia ties like Wikileaks.



... Another key finding, according to CAP’s examination: At least 22 high-ranking Trump campaign officials knew about the contacts during the 2016 campaign and the transition.

The CAP study also claims that the House committee failed to interview individuals involved in 60 percent of the contacts:

In addition to Manafort and Flynn, these include George Papadopoulos, the Trump campaign foreign policy aide whose boast about Russia having “political dirt” on Hillary Clinton sparked an FBI probe; and Anthony Scaramucci, the onetime White House communications director who criticized U.S. sanctions on Russia after a January meeting in Davos, Switzerland, with Kirill Dmitriev, a Kremlin ally and the head of a sanctioned Russian investment fund.

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