From The Hill article found here (Third Paragraph in): "While the panel voted to release that [Democrat's response] memo to the entire House, Republicans expressed concern that publicly releasing the minority memo would damage sensitive intelligence sources and methods, according to Rep. Adam Schiff (D-Calif.), the committee’s ranking member."

This suggests to me that they voted against releasing the DNC Memo at the same time as the Nunes Memo to the Public but are not opposed, and in fact did vote in favor of releasing the memo to the entirety of the House of Representatives. As the Nunes Memo was at this stage about one week ago, it is not out of the question that the Democrat's Memo could be released to the public after it has had time for the rest of the House of Representatives to review the information in the new memo and assess it's value to the public. This seems to be a procedure for how the Intel committee overrides the classification of documents it deems needed for the public to see. The delay is politically adventitious for the Republican position, but I think given the nature of how fractured America has become on these issues, neither memo will convince a significant amount of people to switch horses.

As to why the Republican's voted that way, it seems they wanted to make sure that the Democrats memo did not damage sources and methods, according to Adam Schiff.

From The Hill article found here (Third Paragraph in):

While the panel voted to release that [Democrat's response] memo to the entire House, Republicans expressed concern that publicly releasing the minority memo would damage sensitive intelligence sources and methods, according to Rep. Adam Schiff (D-Calif.), the committee’s ranking member.

This suggests to me that they voted against releasing the DNC Memo at the same time as the Nunes Memo to the Public but are not opposed, and in fact did vote in favor of releasing the memo to the entirety of the House of Representatives. As the Nunes Memo was at this stage about one week ago, it is not out of the question that the Democrat's Memo could be released to the public after it has had time for the rest of the House of Representatives to review the information in the new memo and assess it's value to the public. This seems to be a procedure for how the Intel committee overrides the classification of documents it deems needed for the public to see. The delay is politically adventitious for the Republican position, but I think given the nature of how fractured America has become on these issues, neither memo will convince a significant amount of people to switch horses.

As to why the Republican's voted that way, it seems they wanted to make sure that the Democrats memo did not damage sources and methods, according to Adam Schiff.