Did Donald Trump Jr. speak to his father in June 2016 about a Russian offer to provide dirt on Hillary Clinton? Republicans on the House intelligence committee haven’t even bothered to find out, their Democratic counterparts say.

Committee Republicans on Friday released a 253-page report on Russian interference in the 2016 election, which says they “found no evidence that the Trump campaign colluded, coordinated, or conspired with the Russian government.” But Republicans did not try very hard to find such evidence. Democrats on the panel noted that the GOP did not contact many potential witnesses, subpoena sufficient records to check if witness testimony was accurate, or follow up on leads obtained during the probe.

One particularly notable example of the committee’s less-than-zealous approach to the investigation is its analysis of the infamous June 9, 2016, Trump Tower meeting at which Trump Jr. and other top Trump aides met with a Russian lawyer in an effort to acquire damaging information about Hillary Clinton from the Kremlin.

According to the Democrats’ report, Trump Jr. exchanged calls about the meeting with Emin Agalarov on June 6 at Goldstone’s request. The first call was at 4:04 pm. At 4:27 pm, prior to Trump Jr.’s second call with Emin, Trump Jr. received a call from a “blocked” number. Trump Jr. told the committee last year he did not know who had called him. The Democrats note, however, that Corey Lewandowski, Trump’s first campaign manager, told the committee that Trump Sr.’s “primary residence has a blocked [phone] line.”

Democrats say they made “repeated efforts to obtain the home or cell phone records for then-candidate Trump to determine whether the blocked call was Trump Jr.’s father.” But, they note, “the Majority was unwilling to pursue the matter.”