Trump: Son's Russia meeting was about getting dirt on Clinton

The president tweeted that the meeting was "totally legal" but he maintained he did not know about it beforehand.
2:46 | 08/07/18

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Transcript for Trump: Son's Russia meeting was about getting dirt on Clinton
Other major headline involving president tonight.eting at tower with ians, theresident now tweeting the meeting wasbout geg dirt O Hillary ton. The president'sson,on trump .,as at thatmeing. The president's aidesnce knowledge the presi helped his son explai T meeting months later. E presiden has argued G opposition research on your opponent ictly Lal, but this would haveolved a foreadversary,otentially lping in a U.S. Elec. Here's ABC's chief whiteouse coespondent Jonathan Karl on this front. Reporr: As pridenup his attks on special unsel Robert Muell- The Russian witch H Repor -- he is no blunacknowledgg that a trump toweeting cent to the insts, in fact about getting diclinton from the Russians. S a meeting infoion on an pohe president tweeted over the weekend, "Totally legal and done all the time in politics and it went nowhere. I dit know about it!" That elanation direct contradicts what T Jr. And the whhouse said when the meeting was firstevealed last year. There was nothing, as far as we know, that would lead anyone to believe that the was anythixcept for discussion T adoption Reporter: A written statement by don Jr. S the same thing. A statement the white house first said TSN'te. He certaiy 'T dictate, T you like I said, he weered suggestion like any her would . Reporteut his laws R revealedhe preside did, in fact, dictate the statement. Only a e-mails emerged showing the real reason the meg was set D trumps ackedge it wanoout adoptis. For me, this was O research. It's calledpposition research, or even reo your oppent. Reporter:ampaigns do gather oppositi research L the time, but they don't gr it fr governments especi oil uned states. Coring to gecampaign HP om a foreign Govert would lily be illegal, although the president's L team insts it mightot be. Well, the questio, how ulil I mean, the real questiore is, would a meeting of that Na constituta violatn? So, let's drill Dow on is.jon Karl whse at the white house. And n,s you sai right there, evedate does opposionrch on the opponents, THAs expected, but Al issue her foronths now is the promise ofn an from a for adversary. Reporter: And any S off from aorve David, WOU huge red flags any campaign. It I just nomething that is commonly done. Coer as the FBI director tol would ex aamn who got offer like thatrom a F source, to immediately report it he F David? Jon Karl starting Ano week at the white house for us. You. E also

This transcript has been automatically generated and may not be 100% accurate.

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