Top US official McMaster in Pakistan after hints at tougher stance

US National Security Advisor Lieutenant-General H.R. McMaster arrived in Pakistan on Monday on an unannounced visit, a day after he hinted that Washington could take a tougher stance with Islamabad.It was the first visit by a top member of President Donald Trump's administration to the militancy-hit country.At his previous stop in neighbouring Afghanistan he suggested Washington may take a stronger line with Islamabad, for years seen as an unreliable US ally.