The External Affairs Ministry should immediately take up the matter with British High Commission and seek an explanation since "the report by the magazine was an attempt to interfere into India's internal affairs," he told reporters here.
Stating that the magazine in the editorial said that "Modi as a prime minister will not be good for India," Swamy asked "How do a foreign magazine decide upon our internal affairs?"
Swamy also attacked Union Minister Shashi Tharoor, seeking his second term in Lok Sabha from Thiruvananthapuram in the April 10 polls, saying he had failed to implement his assurances.
"Tharoor failed to implement many of his promises like bringing High Court bench here. He shows more interest in Aranmula Airport project than Vizhinjam Port in his constituency," he charged.
He also wondered why Tharoor was "keeping quite" on the death of his wife Sunanda Pushkar.
Swamy said he would soon approach the court, demanding detailed inquiry into the incident.