"Such a policy is a reprehensible example of Western cultural imperialism and an attempt to impose misplaced but so-called Canadian 'values' on other nations and people," Bishop Crosby wrote in his letter.

"It exploits women when they are most in need of care and support and tragically subverts true prenatal health care. It negates our country's laudable efforts to welcome refugees and offer protection to the world's homeless, when the youngest of human lives will instead be exterminated and the most vulnerable of human beings discarded as unwanted human tissue."

Cardinal Collins said that while it was "commendable and necessary" to support the rights of women and young girls, the prime minister's "public comments suggest that unless a woman has access to abortion or contraception, she is not empowered or able to realize her full potential."

"It is praiseworthy to offer international aid; it is arrogant for powerful, wealthy nations to dictate what priorities developing countries should embrace," he wrote. "Pope Francis has cautioned the rich and powerful West against the danger of 'ideological colonization,' in which such countries and organizations offer funding to help further a particular social agenda.

"Money spent on promoting abortion and contraception could be spent on vaccinating millions of women and girls against malaria or other diseases," the cardinal said, noting that $650 million "could help build a lot of schools or universities, pathways to knowledge for future female leaders of our world."

Cardinal Collins pointed out that Canada "is blessed with prosperity and a wealth of resources."

"Surely we can do better than imposing a distorted vision of the empowerment of women on the people of countries that deserve our support to respond effectively to the challenge of their most pressing needs," he said.

Bishop Crosby said the prime minister's policy and vision "are contrary to the fundamental ethic" of protecting the weak and vulnerable.

He said the policy is "in conflict with the principles instinctively shared by the majority of the world's population and consistently upheld by the Catholic Church: to defend and protect human life from conception to natural death."

Trudeau announced the plan March 8, International Women's Day. The new initiative will support abortions, contraception, sexual education and reproductive health, according to a government statement.

The Trudeau policy is in sharp contrast to that of former Prime Minister Stephen Harper. His government implemented a five-year, $3.5 billion foreign aid program to support maternal and child health that explicitly excluded abortion-related services.

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This story was compiled by the staff of The Catholic Register in Toronto.