"I cannot fail to draw your attention to this further radical assault upon the sanctity of human life, presented as a program for government and the danger of discarding the rights of individual conscience in determining the right to life of the unborn child," he said.
The bishop asked for prayers for candidates and for "light in making the difficult choices which an election involves."
Both Catholic and Anglican leaders have criticized the pro-abortion rights party platforms.
Christine Hardman and James Newcombe, who are Church of England bishops, have written an open letter on behalf of the House of Bishops promising the Anglican bishops will "vigorously challenge any attempt to extend abortion provision beyond the current 24-week limit." Their letter responded to 383 clergy and laity who in their letter to The Times objected to the manifesto promises to decriminalize abortion.
The Catholic Bishops of England and Wales issued a Nov. 29 statement urging voters to consider issues of human rights and the dignity of human life.
The English and Welsh bishops laid out several criteria for voters to consider when choosing their new MPs, foremost of which is respect for human life, including in the womb, and including care for those who are terminally ill and dying "while resisting the false compassion of assisted suicide or euthanasia."
The fate of Northern Ireland as the United Kingdom prepares to leave the European Union was another major focus of Northern Ireland's Catholic bishops. They said the outcome of Brexit will have "a significant impact on our fragile peace and on our political, economic and social life."
"Competent voices are needed to enunciate our concerns and we encourage voters to choose candidates who value positive relationships within and beyond these islands," they said.
Other topics of the bishops' letter included welfare reform, housing and homelessness, and human trafficking.
The major significance of the approaching election "brings an even greater responsibility on us, as followers of Jesus, to reflect in a conscientious and informed way on the breadth of issues involved," the bishops said. They called for prayers for political candidates and respectful discussion about the issues at stake.
The Bishops' Conference of Scotland also stressed the right to life as fundamental. The bishops' pre-election message did not endorse any political party or candidate, but said abortion, assisted suicide, and euthanasia are "always morally unacceptable," and that all politicians should be urged to resist the decriminalization of abortion, which leads toward abortion on demand for any reason.
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The Catholic Parliamentary Office, an agency of the Scottish bishops' conference, also reports on its website the votes of politicians on several bills, organized by parliamentary constituency.
These votes include the decriminalization of abortion, which the office said would clear the way for "abortion on demand, for any reason, up to birth." MPs' votes on a bill to legalize assisted suicide are also recorded, as are how MPs voted on the parliamentary act which imposed permissive abortion laws and same-sex marriage on Northern Ireland.
Distributions of a leaflet version of this information by priests in the Angus area prompted accusations of favoritism towards the local Conservative Party candidate because the leaflets noted the Scottish National Party candidate's pro-abortion rights stand, the newspaper The National reports.
A spokesman for the Scottish Catholic Church rejected this claim.
"As you will be aware 59 different messages were sent out each one referencing the voting record of the incumbent MP. They show a range of voting behavior and do not indicate support or otherwise for any candidate, rather they offer publicly available information to parishioners on the most fundamental moral issues ... addressed in the last parliament," the spokesman said.