The NASA DP and President candidates have defied Attorney General Githu Muigai's warning that such a move is punishable by death as it amounts to treason.
Kalonzo returned from Germany, where his wife Pauline was being treated for an unknown illness, on Wednesday and visited the home of the late Kitui West MP Francis Nyenze on Thursday.
Kalonzo left the country shortly after he and ODM leader Raila withdrew from the October 26 presidential re-run, which they said would be rigged in favour of Uhuru.
Accompanied by leaders of his Wiper party, he told the press that Kenya is on its knees due to leadership by Jubilee Party President Uhuru Kenyatta and Deputy President William Ruto.
"Kenyans came out in large numbers and voted for Raila. NASA won the election on August 8," he said, contrary to announcement by IEBC chairman Wafula Chebukati.
"Tribalism and electoral injustice have halted development so the President should not blame us as we get sworn in. If there will be no dialogue, we must be sworn in."
Uhuru had rejected dialogue but later seemed to have changed his position. He reached out to the Opposition in his address after the inauguration on November 28.
-The Star-WILLIAM MWANGI