Sister Fox has been detained in the Philippines for allegedly joining protest rallies in the country.
She told her lawyer Sol Taule that the government would deport her, Mr Reyes said.
Dozens of protesters could be seen chanting and holding up signs in support of the 71-year-old. Sister Fox was unavailable for comment.
She has been doing missionary work, specifically among farmers and Lumad (indigenous peoples), in the Philippines for the past 27 years.
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Gabriela Representatives Emmi de Jesus and Arlene Brosas strongly condemned the Bureau of Immigration (BI) for reportedly taking into custody for supposed deportation proceedings Fox, who has been campaigning for the welfare of Filipino peasants since the '70s.
In a statement, the BI said that Immigration Commissioner Jaime Morente "approved the recommendation of the BI legal division headed by lawyer Arvin Cesar Santos that Fox be released for further investigation after it was established that the Australian nun holds a valid missionary visa and, thus, she is a properly documented alien".
Fox, a holder of a missionary passport, has been living in the Philippines as a lay missionary for close to three decades and has been active in other fact-finding missions.
"She's a very gentle soul. a really quiet and unassuming character", Mr Murphy, speaking in Sydney, told AAP on Tuesday.
Her detention came a day after Giacomo Filibeck, a Socialist Party official from the European Union who had criticised Duterte's brutal anti-drugs crackdown, was deported. "But by choosing to nab Sister Pat from her home based on flimsy grounds, this regime is only strengthening the growing opposition to Duterte's iron-fisted and tyrannical rule", she said. "People should realise the government has a tendency of being dictatorial", Pabillo said.
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An immigration statement said Fox was detained after she was "reported to have violated the conditions of her stay by attending protest rallies and engaging in political activities".
"She is no criminal or undesirable alien".
'We condemn her unjust detention and the deportation proceedings initiated against her, ' Renato Reyes secretary-general of the leftist Bayan (Nation) movement, said.
Mr Pahilga hopes she'll be released within hours and allowed to remain in the country given "she's done nothing wrong".
A representative from the Australian consulate had communicated with Sister Patricia Fox, whose detention on Monday "created an global reaction", former congressman Satur Ocampo told reporters.
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