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Turkey to 'boycott US ambassador' in escalating diplomatic row
"We have not agreed and are not agreeing to this ambassador making farewell visits with ministers, the parliament speaker and myself," Erdogan said of US ambassador John Bass, who is shortly to leave Turkey after being nominated the US envoy to Afghanistan.
"We do not see him as the representative of the United States in Turkey," he said at a news conference with President Aleksandar Vucic in Belgrade.
It is traditional for outgoing envoys in Turkey to make valedictory visits to bid farewell to top officials before leaving their posts.
Although Bass is expected to leave Turkey in the coming days, it is unprecedented in the history of Turkish-US relations for Ankara to say it no longer recognises Washington's ambassador.
The dispute erupted last week when Turkey arrested a Turkish employee of the American consulate on suspicion of links to the group blamed for last year's failed coup.
He has been formally charged with espionage and seeking to overthrow the Turkish government, accusations the US embassy rejected as "wholly without merit".
Erdogan said the arrest, based on evidence found by the police, shows "something is going on at the Istanbul consulate."
"The US should evaluate one thing: how did those agents leak into the consulate?" Erdogan asked.
"If they did not (put them there), then who put them there? No state would allow such agents to pose such a threat."
The US embassy has dismissed the allegations against the consulate staffer as "baseless".
Analysts have described the dispute as the worst between the NATO allies in half a century.
"It's definitely a historic low in ties, at least in recent memory," said Soner Cagaptay, director of the Turkish Research Programme at the Washington Institute, adding that the last such dispute of this magnitude was after the 1974 Turkish invasion of Cyprus.
"Neither side is willing to step back," he said.
Agencies contributed to this report