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tells abc news that he has two other rallies scheduled this month. whit? >> alex presha in washington. thank you. now, the growing cyber threat facing the u.s. the white house calling ransomware attacks a rising national security concern. and vladimir putin responding to accusations russia is involved with president biden set to meet with the russian president in just days. here's abc's julia macfarlane from london. >> reporter: tonight, growing alarm as cyber criminals attack businesses across america. president biden meeting with members of his national security team today, as the white house now calls the threats a growing matter of national security. >> i certainly think the president views those as a rising national concern, security concern. >> reporter: this as russia's leader, vladimir putin, is now responding to the accusation that russia has been involved, saying, "there hasn't been any malicious russian activity, it's plain ridiculous." the cyber ransom attacks crippling several industries in the u.s.