AAP's Punjab convener Sucha Singh Chhotepur sought to clarify the issue, saying Khetan did not intend to hurt religious sentiments of any community.
"We also heard saying this...He had said it (manifesto) was as sacred for him as Guru Granth Sahib, Gita. But he never compared it with religious books. He meant to say that manifesto was pious for him," he said.
The AAP leader said Khetan tendered his apology with "folded hands" when he "realised his mistake" and therefore "he should be forgiven".
He urged opponents not to fuel the issue in the larger interest of the state and fight with them on political battleground.
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He cited a 2014 incident ahead of 2014 Lok Sabha polls when Punjab minister Bikram Majithia had allegedly distorted a hymn (shabad) of 10th Sikh Guru Gobind Singh while seeking votes for Arun Jaitley, BJP candidate from Amritsar.
Asked to comment on FIR registered against Khetan, Chhotepur said, "We will face the law."
Khetan had allegedly compared the party's Youth Manifesto for Punjab Assembly election with Guru Granth Sahib and other religious books while launching it in Amritsar.
The manifesto had the image of Golden Temple on its cover.
Later he had said the party never "intended to undermine any section, community or any individual" and tendered an apology.
Meanwhile, Shiromani Akali Dal today rejected the apology tendered by Khetan and sought apology by Delhi Chief Minister Arvind Kejriwal.
SAD MP and secretary general Sukhdev Singh Dhindsa alleged
"Kejriwal did not protest against the blasphemy then or even later giving a clear indication of the respect he has for the holy book of the Sikh community. Now it is incumbent on him to seek apology from the Sikh Sangat as well as take strictest action against Khetan. This is necessary to assuage the hurt feelings of the entire Sikh community".
Dhindsa said Khetan had displayed a "mentally sick disposition". "There is no other explanation for the cruel manner in which he insulted the Guru Granth Sahab ji", he said.